IndieLabs-FormsApp Using Spring Framework

IndieLabs
Forms App Using
Spring Framework
Spring Framework MVC Development
Abdulah Al Bahhar
7/21/2015

Table of Contents
1. Introduction ........................................................................................................................... 1
1.1. Application Overview .................................................................................................... 1
1.2. Outcomes........................................................................................................................ 1
1.3. Pre-requisites.................................................................................................................. 1
1.4. Requirements.................................................................................................................. 1
1.5. GitHub Repository ......................................................................................................... 1
2. STS Setup.............................................................................................................................. 2
2.1. STS Loading Main Class Bug........................................................................................ 2
2.2. POM.xml Dependencies................................................................................................. 3
2.2.1. JPA Dependencies................................................................................................... 3
2.2.2 Spring Security Dependencies.................................................................................. 3
2.2.3 Hashing Utilities Dependencies................................................................................ 4
2.2.4 AOP Dependency..................................................................................................... 4
2.2.5 Testing Dependencies............................................................................................... 4
2.2.6 MySQL Dependency................................................................................................ 4
2.3. Servlet-Context.xml Configuration................................................................................ 5
2.4. Datasource.xml Configuration ....................................................................................... 7
2.5. Spring-Security.xml Configuration ................................................................................ 8
2.6. Web.xml Configuration................................................................................................ 11
2.7. Packages....................................................................................................................... 13
2.8. Static Resources ........................................................................................................... 13
2.9. Class Diagram .............................................................................................................. 13
2.10. Database Schema........................................................................................................ 14
3. Models................................................................................................................................. 20
3.1. User .............................................................................................................................. 20
3.2. Role .............................................................................................................................. 24
3.3. Form ............................................................................................................................. 25
3.4. Question........................................................................................................................ 26
3.5. SimpleQuestion ............................................................................................................ 27
3.6. MCQuestion ................................................................................................................. 28
3.7. Choice........................................................................................................................... 29
3.8. SimpleAnswer .............................................................................................................. 30
3.9. ChoiceAnswer .............................................................................................................. 31
4. Repositories......................................................................................................................... 33
4.1. UserRepository............................................................................................................. 33

4.2. RoleRepository............................................................................................................. 33
4.3. FormRepository............................................................................................................ 33
4.4. QuestionRepository...................................................................................................... 34
4.5. SimpleQuestionRepository........................................................................................... 34
4.6. MCQuestionRepository................................................................................................ 34
4.7. ChoiceRepository......................................................................................................... 34
4.8. SimpleAnswerRepository............................................................................................. 35
4.9. ChoiceAnswerRepository............................................................................................. 35
5. Services ............................................................................................................................... 35
5.1. CustomUserDetailsService........................................................................................... 35
5.2. UserService .................................................................................................................. 38
5.3. RoleService .................................................................................................................. 39
5.4. FormService ................................................................................................................. 40
5.5. SimpleQuestionService ................................................................................................ 40
5.6. MCQuestionService ..................................................................................................... 41
5.7. ChoiceService............................................................................................................... 42
5.8. SimpleAnswerService .................................................................................................. 42
5.9. ChoiceAnswerService .................................................................................................. 43
6. MCQuestion Wrapper Class................................................................................................ 44
7. Controllers........................................................................................................................... 45
7.1. Home Controller........................................................................................................... 45
7.2. SecurityNavigation Controller...................................................................................... 46
7.3. FormsController ........................................................................................................... 47
7.4. SimpleQuestionsController .......................................................................................... 49
7.5. MCQuestionsController ............................................................................................... 51
7.6. SimpleAnswerController.............................................................................................. 54
7.7. ChoiceAnswerController.............................................................................................. 55
8. Views................................................................................................................................... 57
8.1. login-form.jsp............................................................................................................... 57
8.2. Users............................................................................................................................. 58
8.2.1. Register.jsp............................................................................................................ 58
8.3. Forms............................................................................................................................ 59
8.3.1. index.jsp ................................................................................................................ 59
8.3.2. details.jsp............................................................................................................... 61
8.3.3. create.jsp................................................................................................................ 63
8.3.4. edit.jsp ................................................................................................................... 64

8.4. SimpleQuestions........................................................................................................... 65
8.4.1. details.jsp............................................................................................................... 65
8.4.2. create.jsp................................................................................................................ 67
8.4.3. edit.jsp ................................................................................................................... 67
8.5. MCQuestions................................................................................................................ 68
8.5.1. details.jsp............................................................................................................... 68
8.5.2. create.jsp................................................................................................................ 70
8.5.3. edit.jsp ................................................................................................................... 71
9. Sample Screenshots............................................................................................................. 72
10. Useful Resources............................................................................................................... 74

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1. Introduction
1.1. Application Overview
This tutorial will take you through learning how to develop a kind of simple Java EE
web application using Spring MVC. The idea of the application is very simple, we
have a collection of forms that contain two types of questions, written and multiple
choice. The admin can manage all of these, and the regular users can answer those
questions many times.
1.2. Outcomes
At the end of this tutorial, you should be able to achieve the following:
 Setup the development environment.
 Setup the XML configurations for dependencies, data source and Spring
Security.
 Create models with the proper relationships mapped to the database.
 Create services.
 Create repositories.
 Create controllers.
 Create views.
1.3. Pre-requisites
1. Good knowledge of development using Java SE.
2. Basic knowledge of MVC pattern.
3. Basic knowledge of HTML.
1.4. Requirements
To follow along with the tutorial, you should have the following:
1. STS IDE installed. (In this tutorial, version 3.6.4 is used)
2. JDK 1.6 or 1.7. (version 1.8 results in problems in the version of STS used,
not sure about higher versions of STS)
3. MySQL 5 database. (In this tutorial, Wamp server is used for this purpose)
1.5. GitHub Repository
All the final files of the project exist on the GitHub repository on the following link:
https://github.com/abahhar/FormsApp

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2. STS Setup
First, we have to create a new Spring MVC project, you could create a new one and it
will create all the default files and directory structure we need.
To create a new Spring MVC Project, please do the following:
1. FileNewSpring Project.
2. Set the project name to FormsApp.
3. Choose Spring MVC Project.
4. Write the package name as: com.abahhar.formsApp.
5. Click finish.
The default Spring MVC project which is created contains a default HomeController
in the package “com.abahhar.formsapp” and a home.jsp webpage in the views folder.
This simple application shows you a hello world page with the current date and time.
To run the application, you could simply drag the application folder “FormsApp” to
the Pivotal tc server which exists in the window below the package explorer, and then
in the same window of the servers, you simply click the green arrow to run the
application.
2.1. STS Loading Main Class Bug
In the current version and the following one, there’s a bug in the IDE that results in
not running the application, you might encounter a statement in the output window
that says “Could not find or load main class”.
To solve the issue, please follow the first solution suggested in the following URL:
http://stackoverflow.com/questions/29004274/error-after-update-to-sts-3-6-4-release

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2.2. POM.xml Dependencies
To be able to use libraries in Spring Framework, we should handle the dependencies
ourselves in pom.xml file which exists in the root document of our application. This
section provides you with the needed dependencies to be added.
2.2.1. JPA Dependencies
4. 
5. <dependency>
6. <groupId>org.springframework</groupId>
7. <artifactId>spring-core</artifactId>
8. <version>${org.springframework-version}</version>
9. </dependency>
10. <dependency>
11. <groupId>org.springframework.data</groupId>
12. <artifactId>spring-data-jpa</artifactId>
13. <version>1.2.0.RELEASE</version>
14. </dependency>
15. <dependency>
16. <groupId>org.springframework</groupId>
17. <artifactId>spring-orm</artifactId>
18. <version>${org.springframework-
version}</version>
19. </dependency>
20. <dependency>
21. <groupId>org.hibernate</groupId>
22. <artifactId>hibernate-
entitymanager</artifactId>
23. <version>4.1.7.Final</version>
24. </dependency>
2.2.2 Spring Security Dependencies

<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-core</artifactId>
<version>3.1.3.RELEASE</version>
</dependency>
<dependency>
<artifactId>spring-security-web</artifactId>
</dependency>
<dependency>
<artifactId>spring-security-config</artifactId>
</dependency>

<dependency>
<artifactId>spring-security-taglibs</artifactId>
</dependency>

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2.2.3 Hashing Utilities Dependencies

<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.10</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.6</version>
</dependency>
2.2.4 AOP Dependency

<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
</dependency>
2.2.5 Testing Dependencies

<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${org.springframework-version}</version>
<scope>test</scope>
</dependency>
2.2.6 MySQL Dependency

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>

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2.3. Servlet-Context.xml Configuration
This configuration file exist in the following directory:
FormsAppsrcmainwebappWEB-INFspringappServlet
Please make sure that it contains the following code:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd"
xmlns:security="http://www.springframework.org/schema/security">

<mvc:annotation-driven />

<mvc:resources mapping="/resources/**" location="/resources/" />

<bean
class="org.springframework.web.servlet.view.InternalResourceViewResol
ver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
<context:annotation-config/>
<context:component-scan base-package="com.abahhar.formsapp" />
<jpa:repositories base-package="com.abahhar.formsapp.repository"/>
<tx:annotation-driven/>
</beans>

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Please notice this fragment of code:
<context:annotation-config/>
<context:component-scan base-package="com.abahhar.formsapp" />
<tx:annotation-driven/>
What this fragment does is that it scans for the Spring components and repositories in
the specified packages. Components can be controllers or services.
This scan is done automatically by Spring Framework in order to inject the
components and repositories later in the code, this is the dependency injection feature
supported in Spring Framework, later in the code when we want to inject a service or
repository, we will need to annotate it with @Autowired, and Spring Framework will
do the job of injecting the right dependency since it scans in the proper packages we
specified in this configuration.
Furthermore, notice the prefix and the suffix values specified by the default Spring
MVC Project, these values will be used to enable the ViewResolver to find the view
that we want. For example, in the controller we could return a string of a view as
“/forms/create”, this string will be evaluated as “WEB-INF/views/forms/create.jsp”.
As you notice, the prefix is added to the beginning of the returned string and the
suffix is added to the end of it.

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2.4. Datasource.xml Configuration
Here we setup the configuration for the database connection, please be sure to include
the configuration file datasource.xml in the package “src/main/resources”, and include
the following fragment of code:
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName"
value="com.mysql.jdbc.Driver"/>
<property name="url"
value="jdbc:mysql://localhost/helloWorld"/>
<property name="username" value="root"/>
<property name="password" value=""/>
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactory
Bean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan"
value="com.abahhar.formsapp.domain" />
<property name="persistenceProviderClass"
value="org.hibernate.ejb.HibernatePersistence" />
<property name="loadTimeWeaver">
<bean
class="org.springframework.instrument.classloading.InstrumentationLoa
dTimeWeaver" />
</property>
<property name="jpaProperties">
<props>
<prop
key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.max_fetch_depth">3</prop>
<prop key="hibernate.jdbc.fetch_size">50</prop>
<prop key="hibernate.jdbc.batch_size">10</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"
/>
</bean>
</beans>
For your settings, put the correct link for the local server hosting the database and its
port if not 80, and the name of the database after the slash “/”, and the correct
username and password. In this tutorial, the name of the database is helloWorld.

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2.5. Spring-Security.xml Configuration
Here we setup the configuration for Spring Security. Spring Security is a ready library
that is used for authentication and authorization of users. Using the following library,
we can have a login system and every user could have roles which with he can be
authorized to the different parts of the application.
Please be sure to include the configuration file spring-security.xml in the package
“src/main/resources”, and include the following fragment of code:
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security-
3.1.xsd"
xmlns:security="http://www.springframework.org/schema/security">
<context:annotation-config />
<context:component-scan base-package="com.abahhar.formsapp.service"
/>

<security:http pattern="/resources/**" security="none"/> 
<security:http auto-config='true' use-expressions="true"> 
<security:intercept-url pattern="/user-login"
access="isAnonymous()"/> 
<security:intercept-url pattern="/forms/**"
access="hasRole('ROLE_USER')"/>
<security:intercept-url pattern="/simpleQuestions/**"
<security:intercept-url pattern="/mcQuestions/**"
<security:intercept-url pattern="/simpleAnswers/**"

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<security:intercept-url pattern="/choiceAnswers/**"
<security:form-login login-page="/user-login"
default-target-url="/forms"
always-use-default-target="true"
authentication-failure-url="/error-login" />
<security:logout logout-success-url="/forms" />
</security:http>

<security:authentication-provider user-service-
ref="customUserDetailsService">
<security:password-encoder hash="sha" />
</beans>
It seems that this file contains a lot of things, but let’s decompose it and explain
what’s happening.
<context:annotation-config />
<context:component-scan base-package="com.abahhar.formsapp.service"
/>
We have seen this fragment of code in servlet-context.xml, but because of the
decomposition we are making, the Spring Security later will need to inject some
service dependencies for its library, and that won’t work unless we add the following
fragment of code in this file.

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<security:http pattern="/resources/**" security="none"/> 
<security:http auto-config='true' use-expressions="true"> 
<security:intercept-url pattern="/user-login"
access="isAnonymous()"/> 
<security:intercept-url pattern="/forms/**"
<security:intercept-url pattern="/simpleQuestions/**"
<security:intercept-url pattern="/mcQuestions/**"
<security:intercept-url pattern="/simpleAnswers/**"
<security:intercept-url pattern="/choiceAnswers/**"
<security:form-login login-page="/user-login"
default-target-url="/forms"
always-use-default-target="true"
authentication-failure-url="/error-login" />
<security:logout logout-success-url="/forms" />
</security:http>
Here we setup the authorization settings, meaning that which links are to be accessed
and which are denied for each role.
First we set the resources folder to be accessible by all, because there is where the
images, CSS and JavaScript files reside.
Second, we set to attributes in the second http tag, auto-config to true, and use-
expressions to true.
Auto-config will make the Spring Security insert default tags and attributes for setting
everything, because there are other things that we do not want to bother ourselves
with, so we let it set it to default values.
Use-expression attribute will enable us to use expressions like “isAnonymous()” and
“hasRole()” in the configuration file and the views later, to be able show the proper
features to proper users.
Intercept-url tag is used to set two things, the URL pattern and the role that is
authorized to access that URL pattern. You can set whatever URL to whatever role
you would like, taking into account that in this application we will have
ROLE_ADMIN and ROLE_USER.
Form-login tag sets the default URL for the login page, the default target URL which
to be directed to after login, the page to be directed to if the login fails and the page to
be directed to after the logout action.

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The last fragments to discuss are the authentication-manager tag, the commented one
could be used to have in-memory users set up by you as you like, which you could use
in running the application as they were to exist as registered users.
The second and used one, is setup to use the customized user service which we will
setup later, and have the hashing setup to be using sha encryption, you could use other
hashing settings such as “plaintext”, which deals with the password with no
encryption, and “md5”, which uses md5 encryption.
2.6. Web.xml Configuration
The last configuration file to modify is web.xml, which exists in the following
directory:
FormsAppsrcmainwebappWEB-INF
Please make sure that the file contains the following fragment of code:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/spring/root-context.xml,
classpath:datasource.xml,
classpath:spring-security.xml
</param-value>
</context-param>

<listener>
<listener-
class>org.springframework.web.context.ContextLoaderListener</listener
-class>
</listener>

<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-
class>org.springframework.web.servlet.DispatcherServlet</servlet-
class>
<init-param>
<param-value>/WEB-INF/spring/appServlet/servlet-
context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>

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<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-
class>org.springframework.web.filter.DelegatingFilterProxy</filter-
class>
</filter>
<filter-mapping>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
Here we have to things added to the default file, the import of the datasource.xml and
spring-security.xml files in this fragment of code:
<context-param>
<param-value>
/WEB-INF/spring/root-context.xml,
classpath:datasource.xml,
classpath:spring-security.xml
</param-value>
</context-param>
And some settings for springSecurityFilterChain that must exist, so that Spring
Security to works:

<filter>
<filter-
class>org.springframework.web.filter.DelegatingFilterProxy</filter-
class>
</filter>
<filter-mapping>
<url-pattern>/*</url-pattern>
</filter-mapping>
Please note in the first fragment of code, “classpath” evaluates to the directory
“src/main/resources”, which is the package stated that you should include the files in
when explaining setting the configuration files.

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2.7. Packages
In this tutorial, we setup the project to have the following packages:
1. Com.abahhar.formsapp
2. Com.abahhar.formsapp.controller
3. Com.abahhar.formsapp.domain
4. Com.abahhar.formsapp.repository
5. Com.abahhar.formsapp.service
6. Com.abahhar.formsapp.wrapper
2.8. Static Resources
Static resources such as images, CSS and JavaScript files should exist in the following
directory: “FormsAppsrcmainwebappresources”.
2.9. Class Diagram
This is the class diagram that the web application is based on:

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2.10. Database Schema
The following is the schema of the database tables that we will be using:
Roles
Role ID Role
Users
User ID Username Password
UsersRoles
User ID Role ID
Forms
Form ID Title
AnsweredForms
User ID Form ID
Questions
Question ID Text Form ID

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SimpleQuestions
Question ID NumberOfQuestions
MCQuestions
Question ID
Choices
Choice ID Text Question ID
AnsweredSimpleQuestion
SimpleAnswer ID Text Question ID User ID
AnsweredMCQuestion
MCAnswer ID Choice ID Question ID User ID

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In order to create the database tables in your database, please use the following SQL
statements:
--
-- Table structure for table `choiceanswers`
--
CREATE TABLE `choiceanswers` (
ìd` int(11) NOT NULL AUTO_INCREMENT,
`choice_id` int(11) NOT NULL,
`question_id` int(11) NOT NULL,
ùser_id` int(11) NOT NULL,
PRIMARY KEY (ìd`),
KEY `choice_id` (`choice_id`),
KEY `question_id` (`question_id`),
KEY ùser_id` (ùser_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=13 ;
-- --------------------------------------------------------
--
-- Table structure for table `choices`
--
CREATE TABLE `choices` (
`text` varchar(50) NOT NULL,
PRIMARY KEY (ìd`),
KEY `question_id_2` (`question_id`)
-- --------------------------------------------------------
--
-- Table structure for table `forms`
--
CREATE TABLE `forms` (
`title` varchar(50) NOT NULL,
PRIMARY KEY (ìd`)
-- --------------------------------------------------------
--
-- Table structure for table `mcquestions`
--
CREATE TABLE `mcquestions` (
PRIMARY KEY (ìd`)
-- --------------------------------------------------------
--
-- Table structure for table `questions`

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--
CREATE TABLE `questions` (
`form_id` int(11) NOT NULL,
PRIMARY KEY (ìd`),
KEY `form_id` (`form_id`)
-- --------------------------------------------------------
--
-- Table structure for table `roles`
--
CREATE TABLE `roles` (
`role` varchar(20) NOT NULL,
PRIMARY KEY (ìd`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=3 ;
-- --------------------------------------------------------
--
-- Table structure for table `simpleanswers`
--
CREATE TABLE `simpleanswers` (
PRIMARY KEY (ìd`),
KEY ùser_id` (ùser_id`)
-- --------------------------------------------------------
--
-- Table structure for table `simplequestions`
--
CREATE TABLE `simplequestions` (
PRIMARY KEY (ìd`)
-- --------------------------------------------------------
--
-- Table structure for table ùsers`
--
CREATE TABLE ùsers` (
`login` varchar(20) NOT NULL,
`password` varchar(50) NOT NULL,
PRIMARY KEY (ìd`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=16 ;

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-- --------------------------------------------------------
--
-- Table structure for table ùsersforms`
--
CREATE TABLE ùsersforms` (
`form_id` int(11) NOT NULL,
PRIMARY KEY (ùser_id`,`form_id`),
KEY `form_id` (`form_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=COMPACT;
-- --------------------------------------------------------
--
-- Table structure for table ùser_roles`
--
CREATE TABLE ùser_roles` (
`role_id` int(6) NOT NULL,
KEY ùser` (ùser_id`),
KEY `role` (`role_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Constraints for dumped tables
--
--
-- Constraints for table `choiceanswers`
--
ALTER TABLE `choiceanswers`
ADD CONSTRAINT `choiceanswers_ibfk_1` FOREIGN KEY (`choice_id`)
REFERENCES `choices` (ìd`) ON DELETE CASCADE,
ADD CONSTRAINT `choiceanswers_ibfk_2` FOREIGN KEY (`question_id`)
REFERENCES `mcquestions` (ìd`) ON DELETE CASCADE,
ADD CONSTRAINT `choiceanswers_ibfk_3` FOREIGN KEY (ùser_id`)
REFERENCES ùsers` (ìd`) ON DELETE CASCADE;
--
-- Constraints for table `choices`
--
ALTER TABLE `choices`
ADD CONSTRAINT `choices_ibfk_1` FOREIGN KEY (`question_id`)
REFERENCES `mcquestions` (ìd`) ON DELETE CASCADE;
--
-- Constraints for table `mcquestions`
--
ALTER TABLE `mcquestions`
ADD CONSTRAINT `mcquestions_ibfk_1` FOREIGN KEY (ìd`) REFERENCES
`questions` (ìd`) ON DELETE CASCADE;
--
-- Constraints for table `questions`
--
ALTER TABLE `questions`

19 | P a g e
ADD CONSTRAINT `questions_ibfk_1` FOREIGN KEY (`form_id`)
REFERENCES `forms` (ìd`) ON DELETE CASCADE;
--
-- Constraints for table `simpleanswers`
--
ALTER TABLE `simpleanswers`
ADD CONSTRAINT `simpleanswers_ibfk_1` FOREIGN KEY (`question_id`)
REFERENCES `simplequestions` (ìd`) ON DELETE CASCADE,
ADD CONSTRAINT `simpleanswers_ibfk_2` FOREIGN KEY (ùser_id`)
REFERENCES ùsers` (ìd`) ON DELETE CASCADE;
--
-- Constraints for table `simplequestions`
--
ALTER TABLE `simplequestions`
ADD CONSTRAINT `simplequestions_ibfk_1` FOREIGN KEY (ìd`)
REFERENCES `questions` (ìd`) ON DELETE CASCADE;
--
-- Constraints for table ùsersforms`
--
ALTER TABLE ùsersforms`
ADD CONSTRAINT ùsersforms_ibfk_1` FOREIGN KEY (ùser_id`)
REFERENCES ùsers` (ìd`) ON DELETE CASCADE,
ADD CONSTRAINT ùsersforms_ibfk_2` FOREIGN KEY (`form_id`)
REFERENCES `forms` (ìd`) ON DELETE CASCADE;
Also, use the following SQL statements to populate users, roles and user_roles tables:
INSERT INTO ùsers` (ìd`, `login`, `password`) VALUES
(1, 'admin', '3d4f2bf07dc1be38b20cd6e46949a1071f9d0e3d'),
(2, 'user', '273a0c7bd3c679ba9a6f5d99078e36e85d02b952');
INSERT INTO `roles` (ìd`, `role`) VALUES
(1, 'admin'),
(2, 'user');
INSERT INTO ùser_roles` (ùser_id`, `role_id`) VALUES
(1, 1),
(2, 2);
The password for admin is: 111111
The password for user is: 222222

20 | P a g e
3. Models
According to the class diagram, the application will have the following models:
 User
 Role
 Form
 Simple Question
 MC Question
 Choice
 Answered Simple Question
 Answered MC Question
In this section, the code of the models and some explanation of the data annotations
used are to be provided. Please make sure that all the models are to be included in the
package “com.abahhar.formsapp.domain”.
3.1. User
package com.abahhar.formsapp.domain;
import java.util.Set;
import javax.persistence.*;
@Entity
@Table(name="users")
public class User {
@Id
@GeneratedValue
private Integer id;
private String login;
private String password;
//---------------------------------Navigation properties---------
------------------------//
@OneToOne(cascade=CascadeType.ALL)
@JoinTable(name="user_roles",
joinColumns = {@JoinColumn(name="user_id",
referencedColumnName="id")},
inverseJoinColumns = {@JoinColumn(name="role_id",
referencedColumnName="id")}
)
private Role role;
@OneToMany(mappedBy="user", cascade=CascadeType.REMOVE,
fetch=FetchType.EAGER)
private Set<SimpleAnswer> simpleAnswers;
@OneToMany(mappedBy="user", cascade=CascadeType.REMOVE,
private Set<ChoiceAnswer> choiceAnswers;

21 | P a g e
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getLogin() {
return login;
}
public void setLogin(String login) {
this.login = login;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Role getRole() {
return role;
}
public void setRole(Role role) {
this.role = role;
}
public Set<SimpleAnswer> getSimpleAnswers() {
return simpleAnswers;
}
public void setSimpleAnswers(Set<SimpleAnswer> simpleAnswers) {
this.simpleAnswers = simpleAnswers;
}
public Set<ChoiceAnswer> getChoiceAnswers() {
return choiceAnswers;
}
public void setChoiceAnswers(Set<ChoiceAnswer> choiceAnswers) {
this.choiceAnswers = choiceAnswers;
}
}

22 | P a g e
This is a regular Java class that you would create, the only thing that you might be
concerned about are the data annotations used, and here is an explanation for each:
Data Annotation Description
Entity
Used to declare a class as an entity to be
used in data access
Table
Used to specify the name of the table that
the model is going to be mapped to
Id
Used to specify that an attribute is the
primary key
GeneratedValue
Used to specify that an attribute is
automatically generated
“Auto_Increment”
OneToOne
Used to specify that a property will have
a one to one relationship with another
navigation property. Cascade attribute is
used to specify the type of cascade
JoinTable
Used to specify the name of the table that
will be used to join two tables, in this
model, the table “user_roles” is used to
join the “user” and “role” tables
JoinColumns
Used to specify to map the joined column
with the models properties, in this
example, “user_id” is mapped to the id of
this current class, and “role_id” is
mapped to the id of the Role class, since
the annotations are put above the
navigation property “role”

23 | P a g e
OneToMany
Used to specify that the current class is
having a one-to-many relationship with
another navigation property, the user has
many simple answers and many choice
answers. MappedBy property specifies
which navigation property in the other
end is used for this class, for example,
mappedBy=user, means that
simpleAnswers and choiceAnswers will
have a navigation property called user,
which will be used for this relationship.
Cascade specifies the type of cascade.
Fetch specifies if the fetching is lazy or
eager.

24 | P a g e
3.2. Role
@Entity
@Table(name="roles")
public class Role {
@Id
@GeneratedValue
private Integer id;
private String role;
//---------------------------------Navigation properties---------
------------------------//
@OneToMany(cascade=CascadeType.ALL)
@JoinTable(name="user_roles",
joinColumns = {@JoinColumn(name="role_id",
referencedColumnName="id")},
inverseJoinColumns = {@JoinColumn(name="user_id",
referencedColumnName="id")}
)
private Set<User> userRoles;
return id;
}
this.id = id;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
public Set<User> getUserRoles() {
return userRoles;
}
public void setUserRoles(Set<User> userRoles) {
this.userRoles = userRoles;
}
}

25 | P a g e
3.3. Form
@Entity
@Table(name="forms")
public class Form {
@Id
@GeneratedValue
private Integer id;
@Column
private String title;
public Form(){
}
public Form(String title){
this.title = title;
}
//---------------------------------Navigation properties-------
--------------------------//
@OneToMany(mappedBy="form", cascade=CascadeType.REMOVE,
private Set<Question> questions;
return id;
}
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Set<Question> getQuestions() {
return questions;
}
public void setQuestions(Set<Question> questions) {
this.questions = questions;
}
}

26 | P a g e
3.4. Question
@Entity
@Table(name="questions")
@Inheritance(strategy=InheritanceType.JOINED) //Joined strategy for
table per subclass
public class Question {
@Id
@GeneratedValue
private Integer id;
@Column
private String text;
public Question(){
}
public Question(String text){
this.text = text;
}
--------------------------//
@ManyToOne
@JoinColumn(name="form_id")
private Form form;
return id;
}
this.id = id;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public Form getForm() {
return form;
}
public void setForm(Form form) {
this.form = form;
}
}

27 | P a g e
Since we are using inheritance and we want it to be mapped to the database schema,
@Inheritance data annotation is used to specify the strategy to be used. According to
the database schema, we are using the joined strategy.
To read more about this strategy and other strategies with applied examples, please
refer to the following article:
http://www.dineshonjava.com/p/implementing-inheritance-in-
hibernate.html#.VZuKlRuqqko
Also, @ManyToOne annotation is used for the relationship used between the form
and question. Since Form class contains @OneToMany, meaning one form to many
questions, then in the other side, which is Question class, we annotate the form
navigation property with @ManyToOne, meaning many questions to one form.
@JoinColumn is used to specify the foreign key to be mapped to in the Questions
table, which in this case is form_id, to be used to refer to the form.
3.5. SimpleQuestion
@Entity
@Table(name="simplequestions")
public class SimpleQuestion extends Question {
public SimpleQuestion(){
super();
}
public SimpleQuestion(String text){
super(text);
}
--------------------------//
@OneToMany(mappedBy="simpleQuestion",
cascade=CascadeType.REMOVE, fetch=FetchType.EAGER)
private Set<SimpleAnswer> simpleAnswers;
public Set<SimpleAnswer> getSimpleAnswers() {
return simpleAnswers;
}
public void setSimpleAnswers(Set<SimpleAnswer> simpleAnswers) {
this.simpleAnswers = simpleAnswers;
}
}

28 | P a g e
3.6. MCQuestion
import java.util.Iterator;
@Entity
@Table(name="mcquestions")
public class MCQuestion extends Question {
public MCQuestion(){
super();
}
--------------------------//
@OneToMany(mappedBy="mcQuestion", cascade=CascadeType.REMOVE,
private Set<Choice> choices;
@OneToMany(mappedBy="mcQuestion", cascade=CascadeType.REMOVE,
public Set<Choice> getChoices() {
return choices;
}
public void setChoices(Set<Choice> choices) {
this.choices = choices;
}
}
}
}

29 | P a g e
3.7. Choice
@Entity
@Table(name="choices")
public class Choice {
@Id
@GeneratedValue
private Integer id;
@Column
public Choice(){
}
public Choice(String text){
this.text = text;
}
--------------------------//
@ManyToOne
@JoinColumn(name="question_id")
private MCQuestion mcQuestion;
@OneToMany(mappedBy="choice", cascade=CascadeType.REMOVE,
return id;
}
this.id = id;
}
return text;
}
this.text = text;
}
public MCQuestion getMcQuestion() {
return mcQuestion;
}
public void setMcQuestion(MCQuestion mcQuestion) {
this.mcQuestion = mcQuestion;
}

30 | P a g e
}
}
}
3.8. SimpleAnswer
@Entity
@Table(name="simpleanswers")
public class SimpleAnswer {
@Id
@GeneratedValue
private Integer id;
@Column
public SimpleAnswer(){
}
public SimpleAnswer(String text){
this.text = text;
}
--------------------------//
@ManyToOne
private SimpleQuestion simpleQuestion;
@ManyToOne
@JoinColumn(name="user_id")
private User user;
return id;
}
this.id = id;
}
return text;
}

31 | P a g e
this.text = text;
}
public SimpleQuestion getSimpleQuestion() {
return simpleQuestion;
}
public void setSimpleQuestion(SimpleQuestion simpleQuestion) {
this.simpleQuestion = simpleQuestion;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
3.9. ChoiceAnswer
@Entity
@Table(name="choiceanswers")
public class ChoiceAnswer {
@Id
@GeneratedValue
private Integer id;
public ChoiceAnswer(){
}
--------------------------//
@ManyToOne
@ManyToOne
@JoinColumn(name="choice_id")
private Choice choice;
@ManyToOne
@JoinColumn(name="user_id")
private User user;
return id;
}
this.id = id;

32 | P a g e
}
return mcQuestion;
}
}
public Choice getChoice() {
return choice;
}
public void setChoice(Choice choice) {
this.choice = choice;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}

33 | P a g e
4. Repositories
In this section, we create interfaces for the repositories that we will be using.
Repositories are used for the data access, this gives us a good separation of the data
access logic so we do not bother ourselves with when writing the logic. Also, all the
interfaces that we will be creating extend a ready interface that is called
JpaRepository, which we specify for it the type that we are dealing with and the type
of its primary key.
JpaRepository includes many built in methods that will help us in inserting, updating
and deleting the entity we are dealing with, which saves our time, because we will not
need to write anything for doing any transaction to the database.
4.1. UserRepository
package com.abahhar.formsapp.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import com.abahhar.formsapp.domain.User;
public interface UserRepository extends JpaRepository<User, Integer>
{
public User findByLogin(String login);
}
4.2. RoleRepository
import com.abahhar.formsapp.domain.Question;
public interface QuestionRepository<T extends Question>
extends JpaRepository<T, Integer> {
}
4.3. FormRepository
import com.abahhar.formsapp.domain.Form;
public interface FormRepository extends JpaRepository<Form, Integer>
{
}

34 | P a g e
4.4. QuestionRepository
public interface QuestionRepository<T extends Question>
extends JpaRepository<T, Integer> {
}
4.5. SimpleQuestionRepository
import com.abahhar.formsapp.domain.SimpleQuestion;
public interface SimpleQuestionRepository extends
QuestionRepository<SimpleQuestion> {
}
4.6. MCQuestionRepository
import com.abahhar.formsapp.domain.MCQuestion;
public interface MCQuestionRepository extends
QuestionRepository<MCQuestion> {
}
4.7. ChoiceRepository
import com.abahhar.formsapp.domain.Choice;
public interface ChoiceRepository extends JpaRepository<Choice,
Integer> {
}

35 | P a g e
4.8. SimpleAnswerRepository
import java.util.List;
import com.abahhar.formsapp.domain.SimpleAnswer;
public interface SimpleAnswerRepository extends
JpaRepository<SimpleAnswer, Integer> {
}
4.9. ChoiceAnswerRepository
import com.abahhar.formsapp.domain.ChoiceAnswer;
public interface ChoiceAnswerRepository extends
JpaRepository<ChoiceAnswer, Integer> {
}
5. Services
In this section, we create the needed services to be used in the application. Services
provide us a good separation of the business logic that we need. Controllers use the
services, and the services use repositories, and with this we have a good separation of
concerns.
Please make sure that the services are in “com.abahhar.formsapp.service” package.
5.1. CustomUserDetailsService
package com.abahhar.formsapp.service;
import java.util.ArrayList;
import java.util.Collection;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import
org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import
org.springframework.security.core.userdetails.UserDetailsService;

36 | P a g e
import
org.springframework.security.core.userdetails.UsernameNotFoundExcepti
on;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.abahhar.formsapp.repository.UserRepository;
@Service
@Transactional(readOnly=true)
public class CustomUserDetailsService implements UserDetailsService {
@Autowired
private UserRepository userRepository;
public UserDetails loadUserByUsername(String login)
throws UsernameNotFoundException {
com.abahhar.formsapp.domain.User domainUser =
userRepository.findByLogin(login);
boolean enabled = true;
boolean accountNonExpired = true;
boolean credentialsNonExpired = true;
boolean accountNonLocked = true;
return new User(
domainUser.getLogin(),
domainUser.getPassword(),
enabled,
accountNonExpired,
credentialsNonExpired,
accountNonLocked,
getAuthorities(domainUser.getRole().getId())
);
}
public Collection<? extends GrantedAuthority>
getAuthorities(Integer role) {
List<GrantedAuthority> authList =
getGrantedAuthorities(getRoles(role));
return authList;
}
public List<String> getRoles(Integer role) {
List<String> roles = new ArrayList<String>();
if (role.intValue() == 1) {
roles.add("ROLE_USER");
roles.add("ROLE_ADMIN");
} else if (role.intValue() == 2) {
roles.add("ROLE_USER");
}
return roles;
}
public static List<GrantedAuthority>
getGrantedAuthorities(List<String> roles) {
List<GrantedAuthority> authorities = new
ArrayList<GrantedAuthority>();

37 | P a g e
for (String role : roles) {
authorities.add(new SimpleGrantedAuthority(role));
}
return authorities;
}
}
This service will be used by Spring Security to do everything about authentication and
authorization with respect to the database. Also, it is the one specified in the spring-
security.xml configuration in the fragment of code:
<security:authentication-provider user-service-
ref="customUserDetailsService">
<security:password-encoder hash="sha" />
Notice that the service is annotated with @Service annotations, to declare it as a
Spring Component, and it will be scanned for dependency injection.
Furthermore, @Transactional annotation is used. For information about this
annotation, please refer to the following link:
http://stackoverflow.com/questions/15300483/some-clarification-about-spring-
transactional-annotation-on-a-method

38 | P a g e
5.2. UserService
import java.util.HashSet;
import org.apache.commons.codec.digest.DigestUtils;
import com.abahhar.formsapp.domain.Role;
import com.abahhar.formsapp.repository.RoleRepository;
import com.abahhar.formsapp.repository.UserRepository;
@Service
@Transactional
public class UserService {
@Autowired
private UserRepository userRepository;
@Autowired
private RoleRepository roleRepository;
public User getUser(String login){
return userRepository.findByLogin(login);
}
public boolean registerUser(User user){
User loadedUser =
userRepository.findByLogin(user.getLogin());
if(loadedUser != null){
return false;
}
String hashedPassword =
DigestUtils.sha1Hex(user.getPassword());
Role role = roleRepository.findOne(2);
List<User> usersList = userRepository.findAll();
Set<User> userRoles = new HashSet<User>();
Iterator<User> iterator = usersList.iterator();
while(iterator.hasNext()){
User userRole = iterator.next();
//The admin doesn't need to have the ROLE_USER,
only users
if(userRole.getRole().getId() != 1){
userRoles.add(userRole);
}
}
userRoles.add(user);
role.setUserRoles(userRoles);

39 | P a g e
user.setPassword(hashedPassword);
roleRepository.save(role);
return true;
}
}
This service is what we will use in the controllers to deal with users, as you notice, we
use two repositories here which are: UserRepository and RoleRepository. The
repositories are automatically injected by the framework since annotated with
@Autowired.
Also, we have two methods: getUser, which retrieves for us a user by his username,
and registerUser, which registers a user.
Please notice that in the registerUser we encrypt the password with sha1 encryption,
and we add the user role for the registered user, then save it in the database using the
repository.
5.3. RoleService
import com.abahhar.formsapp.domain.Role;
import com.abahhar.formsapp.repository.RoleRepository;
@Service
@Transactional
public class RoleService {
@Autowired
private RoleRepository roleRepository;
public Role getRole(int id){
return roleRepository.findOne(id);
}
}

40 | P a g e
5.4. FormService
import com.abahhar.formsapp.repository.FormRepository;
@Service
@Transactional
public class FormService {
@Autowired
private FormRepository formRepository;
public Iterable<Form> findAll() {
return formRepository.findAll();
}
public Form save(Form entity) {
return formRepository.save(entity);
}
public void delete(Integer id) {
formRepository.delete(id);
}
public Form findOne(Integer id) {
return formRepository.findOne(id);
}
}
5.5. SimpleQuestionService
import com.abahhar.formsapp.repository.SimpleQuestionRepository;
@Service
@Transactional
public class SimpleQuestionService {
@Autowired
private SimpleQuestionRepository simpleQuestionRepository;
public Iterable<SimpleQuestion> findAll() {
return simpleQuestionRepository.findAll();
}
public SimpleQuestion save(SimpleQuestion entity) {
return simpleQuestionRepository.save(entity);

41 | P a g e
}
simpleQuestionRepository.delete(id);
}
public SimpleQuestion findOne(Integer id) {
return simpleQuestionRepository.findOne(id);
}
}
5.6. MCQuestionService
import com.abahhar.formsapp.repository.MCQuestionRepository;
@Service
@Transactional
public class MCQuestionService {
@Autowired
private MCQuestionRepository mcQuestionRepository;
public Iterable<MCQuestion> findAll() {
return mcQuestionRepository.findAll();
}
public MCQuestion save(MCQuestion entity) {
return mcQuestionRepository.save(entity);
}
mcQuestionRepository.delete(id);
}
public MCQuestion findOne(Integer id) {
return mcQuestionRepository.findOne(id);
}
}

42 | P a g e
5.7. ChoiceService
import com.abahhar.formsapp.repository.ChoiceRepository;
@Service
@Transactional
public class ChoiceService {
@Autowired
private ChoiceRepository choiceRepository;
public Iterable<Choice> findAll() {
return choiceRepository.findAll();
}
public Choice save(Choice entity) {
return choiceRepository.save(entity);
}
choiceRepository.delete(id);
}
public Choice findOne(Integer id) {
return choiceRepository.findOne(id);
}
}
5.8. SimpleAnswerService
import com.abahhar.formsapp.repository.SimpleAnswerRepository;
@Service
@Transactional
public class SimpleAnswerService {
@Autowired
private SimpleAnswerRepository simpleAnswerRepository;
public Iterable<SimpleAnswer> findAll() {
return simpleAnswerRepository.findAll();

43 | P a g e
}
public SimpleAnswer save(SimpleAnswer entity) {
return simpleAnswerRepository.save(entity);
}
simpleAnswerRepository.delete(id);
}
public SimpleAnswer findOne(Integer id) {
return simpleAnswerRepository.findOne(id);
}
}
5.9. ChoiceAnswerService
import com.abahhar.formsapp.repository.ChoiceAnswerRepository;
@Service
@Transactional
public class ChoiceAnswerService {
@Autowired
private ChoiceAnswerRepository choiceAnswerRepository;
public Iterable<ChoiceAnswer> findAll() {
return choiceAnswerRepository.findAll();
}
public ChoiceAnswer save(ChoiceAnswer entity) {
return choiceAnswerRepository.save(entity);
}
choiceAnswerRepository.delete(id);
}
public ChoiceAnswer findOne(Integer id) {
return choiceAnswerRepository.findOne(id);
}
}

44 | P a g e
6. MCQuestion Wrapper Class
MCQuestionWrapper is a wrapper class that we will be using later in
MCQuestionController, to avoid any errors later, please make sure that this class exist
in “com.abahhar.formsapp.wrapper” package.
This class wraps an MCQuestion with the list of choices.
package com.abahhar.formsapp.wrapper;
public class MCQuestionWrapper {
private List<Choice> choices;
public MCQuestionWrapper(){
this.mcQuestion = new MCQuestion();
this.choices = new ArrayList<Choice>();
}
return mcQuestion;
}
}
public List<Choice> getChoices() {
return choices;
}
public void setChoices(List<Choice> choices) {
this.choices = choices;
}
}

45 | P a g e
7. Controllers
In this section, we create the proper controllers for the web application with proper
actions.
Please make sure that the controllers are in “com.abahhar.formsapp.controller”
package, except for HomeController, which is in “com.abahhar.formsapp” package.
7.1. Home Controller
package com.abahhar.formsapp;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
/**
* Handles requests for the application home page.
*/
@Controller
public class HomeController {
/**
* Simply selects the home view to render by returning its
name.
*/
@RequestMapping(value = "/", method = RequestMethod.GET)
public ModelAndView home() {
return new ModelAndView("redirect:/forms");
}
}
This controller contains the action home(), which you could access by going to URL
localhost/. The mapping of the URL to the action is specified by the value attribute in
the data annotation @RequestMapping, and the method specified is GET method.
This action redirects the user to “localhost/forms”. As you notice, the action returns
ModelAndView, which is a type that enables you to specify the path for the view to
return to, and enables you to include models and data to be returned to the view.
Another thing to notice is that if you want the Spring Framework to know that the
class is a Spring Controller “Component”, then you must put @Controller annotation
on the controller as done in this fragment of code, and you will notice in the package
explorer, the icon of the file will have a blue S on it, which means that this is a Spring
Component.

46 | P a g e
7.2. SecurityNavigation Controller
This controller will handle the navigation for login, success-login and logout actions,
because we are using Spring MVC, we should make the controller with URL
mappings to the desired procedures, and this is what we are doing here:
package com.abahhar.formsapp.controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import com.abahhar.formsapp.service.UserService;
@Controller
public class SecurityNavigation {
@Autowired
UserService userService;
@RequestMapping(value="/user-login", method=RequestMethod.GET)
public ModelAndView loginForm() {
return new ModelAndView("login-form");
}
@RequestMapping(value="/error-login", method=RequestMethod.GET)
public ModelAndView invalidLogin() {
ModelAndView modelAndView = new ModelAndView("login-form");
modelAndView.addObject("error", true);
return modelAndView;
}
@RequestMapping(value="/success-login", method=RequestMethod.GET)
public ModelAndView successLogin() {
return new ModelAndView("success-login");
}
@RequestMapping(value="/users/register",
method=RequestMethod.GET)
public ModelAndView register(){
return new ModelAndView("users/register");
}
@RequestMapping(value="/users/register",
method=RequestMethod.POST)
public ModelAndView register(@ModelAttribute("user") User use
if(!userService.registerUser(user)){
return new
ModelAndView("users/register").addObject("error", true);
}
return new ModelAndView("login-form").addObject("registered",
true);}
}
As you notice, the controller contains proper actions for login, success-login, logout
and register. Also, you notice that we have UserService which is annotated with
@Autowired.
@ModelAttribute is used to set the name of the entity that is got from the form in the
view, the name of the entity should be contained in the name attribute of the form tag.

47 | P a g e
7.3. FormsController
import java.util.HashSet;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.abahhar.formsapp.service.FormService;
@Controller
public class FormsController {
@Autowired
private FormService formService;
@RequestMapping(value="/forms", method=RequestMethod.GET)
public ModelAndView index(){
ModelAndView modelAndView = new
ModelAndView("forms/index");
modelAndView.addObject("forms", formService.findAll());
}
@RequestMapping(value="/forms/details",
public ModelAndView details(@RequestParam Integer id){
ModelAndView("forms/details");
Form form = formService.findOne(id);
Set<SimpleQuestion> simpleQuestions = new
HashSet<SimpleQuestion>();
Set<MCQuestion> mcQuestions = new HashSet<MCQuestion>();
Iterator<Question> iterator =
form.getQuestions().iterator();
Question question = iterator.next();
if(question instanceof SimpleQuestion){
SimpleQuestion simpleQuestion =
(SimpleQuestion) question;
simpleQuestions.add(simpleQuestion);
}else{
MCQuestion mcQuestion = (MCQuestion)
question;

48 | P a g e
mcQuestions.add(mcQuestion);
}
}
modelAndView.addObject("form", formService.findOne(id));
modelAndView.addObject("simpleQuestions",
simpleQuestions);
modelAndView.addObject("mcQuestions", mcQuestions);
}
@RequestMapping(value="/forms/create",
public String create(){
return "forms/create";
}
@RequestMapping(value="/forms/create",
@ResponseBody
public ModelAndView create(@ModelAttribute("form") Form form){
formService.save(form);
return new ModelAndView("redirect:/forms");
}
@RequestMapping(value="/forms/update",
public ModelAndView update(@RequestParam Integer id){
ModelAndView("forms/edit");
modelAndView.addObject("form", formService.findOne(id));
}
@RequestMapping(value="/forms/update",
public ModelAndView update(@ModelAttribute("form") Form form){
ModelAndView("redirect:/forms/details?id="+form.getId().toString());
formService.save(form);
}
@RequestMapping(value="/forms/delete",
public ModelAndView delete(@RequestParam Integer id){
ModelAndView("redirect:/forms");
formService.delete(id);
}
}

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The new thing here is @RequestParam annotation, this is used to specify that a
variable is got from the string parameters (e.g. /forms/update?id=1).
Another thing to notice is that when inserting and updating an entity, we use the save
method from the service. The save method could insert and update at the same time
because of the id of the entity, if the id doesn’t exist in the table, then the entity is new
and will be inserted, but if the id exists, it will update the existed one. All this is
handled automatically in the repository.
7.4. SimpleQuestionsController
import com.abahhar.formsapp.service.SimpleQuestionService;
@Controller
public class SimpleQuestionsController {
@Autowired
private SimpleQuestionService simpleQuestionService;
@Autowired
@RequestMapping(value="/simpleQuestions/details",
ModelAndView("simpleQuestions/details");
modelAndView.addObject("simpleQuestion",
simpleQuestionService.findOne(id));
}
@RequestMapping(value="/simpleQuestions/create",
public ModelAndView create(@RequestParam Integer formId){
ModelAndView("simpleQuestions/create");
modelAndView.addObject("form",
formService.findOne(formId));
}

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@RequestMapping(value="/simpleQuestions/create",
@ResponseBody
public ModelAndView create(@ModelAttribute("simpleQuestion")
SimpleQuestion simpleQuestion){
simpleQuestionService.save(simpleQuestion);
return new
ModelAndView("redirect:/forms/details?id="+simpleQuestion.getForm().g
etId().toString());
}
@RequestMapping(value="/simpleQuestions/update",
ModelAndView("simpleQuestions/edit");
modelAndView.addObject("simpleQuestion",
simpleQuestionService.findOne(id));
}
@RequestMapping(value="/simpleQuestions/update",
public ModelAndView update(@ModelAttribute("simpleQuestion")
SimpleQuestion simpleQuestion){
simpleQuestion =
simpleQuestionService.save(simpleQuestion);
ModelAndView("redirect:/forms/details?id="+simpleQuestion.getForm().g
etId().toString());
}
@RequestMapping(value="/simpleQuestions/delete",
Integer formId =
simpleQuestionService.findOne(id).getForm().getId();
ModelAndView("redirect:/forms/details?id="+formId.toString());
simpleQuestionService.delete(id);
}
}

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7.5. MCQuestionsController
import com.abahhar.formsapp.service.ChoiceService;
import com.abahhar.formsapp.service.MCQuestionService;
import com.abahhar.formsapp.wrapper.MCQuestionWrapper;
@Controller
public class MCQuestionsController {
@Autowired
private MCQuestionService mcQuestionService;
@Autowired
private ChoiceService choiceService;
@Autowired
@RequestMapping(value="/mcQuestions/details",
ModelAndView("mcQuestions/details");
modelAndView.addObject("mcQuestion",
mcQuestionService.findOne(id));
}
@RequestMapping(value="/mcQuestions/create",
public ModelAndView create(@RequestParam Integer formId){
ModelAndView("mcQuestions/create");
MCQuestionWrapper mcQuestionWrapper = new
MCQuestionWrapper();
//add 4 choices to be filled
for(int i = 1; i <= 4; i++){
mcQuestionWrapper.getChoices().add(new Choice());

52 | P a g e
}
modelAndView.addObject("form",
formService.findOne(formId));
modelAndView.addObject("mcQuestionWrapper",
mcQuestionWrapper);
}
@RequestMapping(value="/mcQuestions/create",
@ResponseBody
public ModelAndView create(@ModelAttribute("mcQuestionWrapper")
MCQuestionWrapper mcQuestionWrapper){
MCQuestion mcQuestion =
mcQuestionWrapper.getMcQuestion();
List<Choice> choices = mcQuestionWrapper.getChoices();
mcQuestionService.save(mcQuestion);
Iterator<Choice> iterator = choices.iterator();
Choice choice = iterator.next();
choice.setMcQuestion(mcQuestion);
choiceService.save(choice);
}
return new
ModelAndView("redirect:/forms/details?id="+mcQuestion.getForm().getId
().toString());
}
@RequestMapping(value="/mcQuestions/update",
ModelAndView("mcQuestions/edit");
MCQuestionWrapper mcQuestionWrapper = new
MCQuestionWrapper();
MCQuestion mcQuestion = mcQuestionService.findOne(id);
mcQuestionWrapper.setMcQuestion(mcQuestion);
Set<Choice> choices = mcQuestion.getChoices();
List<Choice> choicesList = new ArrayList<Choice>();
for(Iterator<Choice> iterator = choices.iterator();
iterator.hasNext(); ){
choicesList.add(iterator.next());
}
mcQuestionWrapper.setChoices(choicesList);
modelAndView.addObject("mcQuestionWrapper",
mcQuestionWrapper);
}

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@RequestMapping(value="/mcQuestions/update",
public ModelAndView update(@ModelAttribute("mcQuestionWrapper")
MCQuestionWrapper mcQuestionWrapper){
mcQuestionWrapper.getMcQuestion();
List<Choice> choices = mcQuestionWrapper.getChoices();
mcQuestionService.save(mcQuestion);
mcQuestion =
mcQuestionService.findOne(mcQuestion.getId());
Iterator<Choice> iterator =
mcQuestion.getChoices().iterator();
Integer choiceId = iterator.next().getId();
choiceService.delete(choiceId);
}
iterator = choices.iterator();
Choice choice = iterator.next();
choice.setMcQuestion(mcQuestion);
choiceService.save(choice);
}
return new
ModelAndView("redirect:/forms/details?id="+mcQuestion.getForm().getId
().toString());
}
@RequestMapping(value="/mcQuestions/delete",
Integer formId =
mcQuestionService.findOne(id).getForm().getId();
ModelAndView("redirect:/forms/details?id="+formId.toString());
mcQuestionService.delete(id);
}
}

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7.6. SimpleAnswerController
import
org.springframework.security.core.context.SecurityContextHolder;
import com.abahhar.formsapp.service.SimpleAnswerService;
import com.abahhar.formsapp.service.SimpleQuestionService;
@Controller
public class SimpleAnswersController {
@Autowired
private SimpleAnswerService simpleAnswerService;
@Autowired
private SimpleQuestionService simpleQuestionService;
@Autowired
@RequestMapping(value="/simpleAnswers/create",
@ResponseBody
public ModelAndView create(@ModelAttribute("simpleAnswer")
SimpleAnswer simpleAnswer){
ModelAndView("redirect:/simpleQuestions/details?id="+simpleAnswer.get
SimpleQuestion().getId().toString());
String login =
SecurityContextHolder.getContext().getAuthentication().getName();
User user = userService.getUser(login);
simpleAnswer.setUser(user);
SimpleQuestion simpleQuestion =
simpleQuestionService.findOne(simpleAnswer.getSimpleQuestion().getId(
));
simpleAnswer.setSimpleQuestion(simpleQuestion);
simpleAnswerService.save(simpleAnswer);
}
@RequestMapping(value="/simpleAnswers/delete",

55 | P a g e
public ModelAndView delete(@RequestParam Integer answerId,
@RequestParam Integer questionId){
ModelAndView("redirect:/simpleQuestions/details?id="+questionId);
simpleAnswerService.delete(answerId);
}
}
The new thing here is that we are using the following statement to get the username of
the current user:
String login =
Which with we get the entity of the user and set it to the simple answer, and because
of this assignment, the foreign key of the user id is set automatically after saving the
simple answer.
7.7. ChoiceAnswerController
import
org.springframework.security.core.context.SecurityContextHolder;
import com.abahhar.formsapp.service.ChoiceAnswerService;
import com.abahhar.formsapp.service.MCQuestionService;
@Controller
public class ChoiceAnswersController {
@Autowired
private ChoiceAnswerService choiceAnswerService;
@Autowired
private MCQuestionService mcQuestionService;
@Autowired

56 | P a g e
@RequestMapping(value="/choiceAnswers/create",
@ResponseBody
public ModelAndView create(@ModelAttribute("choiceAnswer")
ChoiceAnswer choiceAnswer){
ModelAndView("redirect:/mcQuestions/details?id="+choiceAnswer.getMcQu
estion().getId().toString());
String login =
User user = userService.getUser(login);
choiceAnswer.setUser(user);
mcQuestionService.findOne(choiceAnswer.getMcQuestion().getId());
choiceAnswer.setMcQuestion(mcQuestion);
choiceAnswerService.save(choiceAnswer);
}
@RequestMapping(value="/choiceAnswers/delete",
public ModelAndView delete(@RequestParam Integer answerId,
@RequestParam Integer questionId){
ModelAndView("redirect:/mcQuestions/details?id="+questionId);
choiceAnswerService.delete(answerId);
}
}

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8. Views
8.1. login-form.jsp
<div class="container">
<h2 class="text-center">Login</h2>
<c:if test="${error == true}">
<p>
<b class="text-danger">Invalid login or
password.</b>
</p>
</c:if>
<c:if test="${registered == true}">
<p>
<b class="text-success">Successfully
registered, please enter credentials to login.</b>
</p>
</c:if>
<form class="form-horizontal" role="form" method="POST"
action="<c:url value="/j_spring_security_check"/>" >
<div class="form-group">
<label class="control-label col-sm-2"
for="j_username">Username:</label>
<div class="col-sm-10">
<input type="text" class="form-control"
name="j_username" id="j_username" placeholder="Enter username"
autofocus>
</div>
</div>
for="j_password">Password:</label>
<input type="password" class="form-control"
name="j_password" id="j_password" placeholder="Enter password">
</div>
</div>
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-
default">Login</button>
</div>
</div>
</form>
Here we have two if statements, one to check the value of error, and the other to
check the value of registered. These two values are returned from the controller
through the statements with the following signature
“modelAndView.addObject(“NameOfVariable”, valueOfVariable)”.
If the if statement is satisfied, the content inside the tag will be written in the output.
<c:url /> tag is used to evaluate a statement that contains the current URL, followed
by the value of the “value” attribute.

58 | P a g e
Please notice that “j_username” and “j_password” are the names of variables that
Spring Security deal with when passing the arguments from the views.
8.2. Users
8.2.1. Register.jsp
<h2 class="text-center">Registration form</h2>
<c:if test="${error == true}">
<p>
<b class="text-danger">Username already
exists.</b>
</p>
</c:if>
<form class="form-horizontal" role="form" name="user"
method="POST" action="<c:url value="/users/register"/>" >
for="login">Username:</label>
name="login" id="login" placeholder="Enter username" autofocus>
</div>
</div>
for="password">Password:</label>
<input type="password" class="form-control"
name="password" id="password" placeholder="Enter password">
</div>
</div>
default">Register</button>
</div>
</div>
</form>

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8.3. Forms
8.3.1. index.jsp
<sec:authorize access="hasRole('ROLE_ADMIN')">
<p>
<a href="<c:url value="/forms/create"/>"
class="btn btn-default btn-lg">Create form</a>
</p>
</sec:authorize>

<div class="row">
<div class="col-lg-12">
<h3>Latest Forms</h3>
</div>
</div>

<c:choose>
<c:when test="${not empty forms }">

<div class="row text-center">
<c:forEach var="form" items="${forms}">
<a href="<c:url
value="forms/details?id=${form.id}" />">
<div class="col-md-3 col-sm-6 hero-
feature">
<div class="thumbnail">
<img src="<c:url
value="/resources/img/form-icon.png" />" alt="">
<div class="caption">
<h3>${form.title}</h3>
<sec:authorize
access="hasRole('ROLE_ADMIN')">
<p>
<a href="<c:url
value="forms/update?id=${form.id}"/>" class="btn btn-
primary">Edit</a> <a href="<c:url
value="forms/delete?id=${form.id}"/>" class="btn btn-
default">Delete</a>
</p>
</sec:authorize>
</div>
</div>
</div>
</a>
</c:forEach>
</div>

</c:when>
<c:otherwise>
There are no forms
</c:otherwise>
</c:choose>

60 | P a g e
Here we checked the role of the user using the tag <sec:authorize>, we check if the
user is with the role of admin, if the check is satisfied, the button for creating a form
will be displayed in the output.
Also, we used the tags <c:choose>, <c:when> and <c:otherwise>. When using the
choose tag, when will behave as an if statement with the condition in the test attribute,
and otherwise will behave as an else if the condition in the when tag is not satisfied.
Furthermore, we use the tag <c:foreach> to loop through the list of forms we have got
from the controller, we set each item in the list of forms to a variable which we called
“form”, then we used the properties of the form to display them in the page.
Please notice that to access the properties of an object in JSP pages, we include the
name of the property in ${} (e.g. ${form.title}).
Also, to use the authorize tag you should include this fragment of code after the
declaration of the xml file <?xml version=”1.0” encoding=”UTF-9”?>:
<%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %>

61 | P a g e
8.3.2. details.jsp
<h2 class="text-center">${form.title}</h2>
<h4>
<a href="<c:url value="/forms"/>">Back to forms</a>
</h4>
<sec:authorize access="hasRole('ROLE_ADMIN')">
<p>
<a href="<c:url
value="/simpleQuestions/create?formId=${form.id}"/>" class="btn btn-
default btn-lg">Create simple question</a>
<a href="<c:url
value="/mcQuestions/create?formId=${form.id}"/>" class="btn btn-
default btn-lg">Create multiple choice question</a>
</p>
</sec:authorize>
<c:choose>
<c:when test="${not empty simpleQuestions}">
<table class="table table-striped
table-bordered" style="font-size: 18px">
<thead>
<tr>
<th>Simple questions</th>
<sec:authorize
<th colspan="2" class="text-
center">Manage</th>
</sec:authorize>
</tr>
</thead>
<tbody>
<c:forEach var="simpleQuestion"
items="${simpleQuestions}">
<tr>
<td style="padding: 10px">
<a href="<c:url
value="../simpleQuestions/details?id=${simpleQuestion.id}" />" >
${simpleQuestion.text}
</a>
</td>
<sec:authorize
<td class="text-center">
<a href="<c:url
value="../simpleQuestions/update?id=${simpleQuestion.id}" />" >
Edit
</a>
</td>
<a href="<c:url
value="../simpleQuestions/delete?id=${simpleQuestion.id}" />" >
Delete
</a>
</td>
</sec:authorize>
</tr>

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</c:forEach>
</tbody>
</table>
</c:when>
<c:otherwise>
<div class="well">
There are no written questions
</div>
</c:otherwise>
</c:choose>
<c:choose>
<c:when test="${not empty mcQuestions}">
<table class="table table-striped
table-bordered" style="font-size: 18px">
<thead>
<tr>
<th>Multiple choice questions</th>
<sec:authorize
<th colspan="2" class="text-
center">Manage</th>
</sec:authorize>
</tr>
</thead>
<tbody>
<c:forEach var="mcQuestion"
items="${mcQuestions}">
<tr>
<a href="<c:url
value="../mcQuestions/details?id=${mcQuestion.id}" />" >
${mcQuestion.text}
</a>
</td>
<sec:authorize
<a href="<c:url
value="../mcQuestions/update?id=${mcQuestion.id}" />" >
Edit
</a>
</td>
<a href="<c:url
value="../mcQuestions/delete?id=${mcQuestion.id}" />" >
Delete
</a>
</td>
</sec:authorize>
</tr>
</c:forEach>
</tbody>
</table>
</c:when>
<c:otherwise>
<div class="well">
There are no multiple choice questions

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</div>
</c:otherwise>
</c:choose>
8.3.3. create.jsp
<h2 class="text-center">Create form</h2>
<p>
<form class="form-horizontal" role="form" name="form"
method="POST" action="<c:url value="/forms/create"/>" >
for="title">title:</label>
name="title" id="title" placeholder="Enter title" autofocus>
</div>
</div>
default">create</button>
</div>
</div>
</form>
<h4>
<a href="<c:url value="/forms"/>">Back</a>
</h4>
Here is a usual form that could be created using HTML, the thing to focus on here is
that we set a name attribute in the form tag, this name is should be the same name as
the one to be used in the action of the controller, which is set in @ModelAttribute
annotation.

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8.3.4. edit.jsp
<h2 class="text-center">Edit form: ${form.title}</h2>
<p>
<form class="form-horizontal" role="form" name="form"
method="POST" action="<c:url value="/forms/update"/>" >
for="title">title:</label>
name="title" id="title" value="${form.title}" autofocus>
</div>
</div>
<input type="hidden" name="id" value="${form.id}" />
default">Update</button>
</div>
</div>
</form>
<h4>
</h4>

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8.4. SimpleQuestions
8.4.1. details.jsp
<h4>
<a href="<c:url
value="/forms/details?id=${simpleQuestion.form.id}"/>">Back to
form</a>
</h4>
<h3>${simpleQuestion.text}</h3>
<hr />
<h2 class="text-center">Add Answer</h2>
<form class="form-horizontal" role="form" name="simpleAnswer"
method="POST" action="<c:url value="/simpleAnswers/create"/>" >
for="text">Answer:</label>
<textarea class="form-control" name="text"
id="text"></textarea>
</div>
<input type="hidden" name="simpleQuestion.id"
value="${simpleQuestion.id}"/>
</div>
<button type="submit" class="btn btn-default">Add
Answer</button>
</div>
</div>
</form>
<hr />
<h2 class="text-center">Answers</h2>
<c:choose>
<c:when test="${not empty
simpleQuestion.simpleAnswers}">
<table class="table table-striped">
<thead>
<tr style="font-size: 18px">
<th>
User
</th>
<th>
Answer
</th>
<sec:authorize
<th>
Manage
</th>
</sec:authorize>
</tr>
</thead>
<tbody>

66 | P a g e
<c:forEach var="simpleAnswer"
items="${simpleQuestion.simpleAnswers}">
<tr>
${simpleAnswer.user.login}
</td>
${simpleAnswer.text}
</td>
<sec:authorize
<a href="<c:url
value="/simpleAnswers/delete?answerId=${simpleAnswer.id}&questionId=$
{simpleQuestion.id}"/>" >Delete</a>
</td>
</sec:authorize>
</tr>
</c:forEach>
</tbody>
</table>
</c:when>
<c:otherwise>
There are no answers
</c:otherwise>
</c:choose>
Here we have a form so that users can answer the written question, the form is used to
pass a SimpleAnswer to SimpleAnswersController.
Also, we loop through the simple answers contained in the simple question and
display the answers with the names of the users. As you can notice, because of the
navigation properties we have and the configured relationships, we can access all the
needed entities easily.

67 | P a g e
8.4.2. create.jsp
<h2 class="text-center">Create simple question for form:
${form.title}</h2>
<p>
<form class="form-horizontal" role="simpleQuestion"
name="simpleQuestion" method="POST" action="<c:url
value="/simpleQuestions/create"/>" >
for="text">Question:</label>
<input type="text" class="form-control" name="text"
id="text" placeholder="Enter question" autofocus>
<input type="hidden" name="form.id"
value="${form.id}" />
</div>
</div>
</div>
</div>
</form>
<h4>
</h4>
8.4.3. edit.jsp
<h2 class="text-center">Edit question:
${simpleQuestion.text}</h2>
<p>
<form class="form-horizontal" role="simpleQuestion"
name="simpleQuestion" method="POST" action="<c:url
value="/simpleQuestions/update"/>" >
<input type="text" class="form-control" name="text"
id="text" value="${simpleQuestion.text}" autofocus>
</div>
</div>
<input type="hidden" name="id"
value="${simpleQuestion.id}" />
</div>
</div>
</form>

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8.5. MCQuestions
8.5.1. details.jsp
<h4>
<a href="<c:url
value="/forms/details?id=${mcQuestion.form.id}"/>">Back to form</a>
</h4>
<h3>${mcQuestion.text}</h3>
<hr />
<h2 class="text-center">Choose Answer</h2>
<form class="form-horizontal" role="form" name="choiceAnswer"
method="POST" action="<c:url value="/choiceAnswers/create"/>" >
<c:forEach var="choice"
items="${mcQuestion.choices}">
<label class="control-label col-sm-2" for="text">
<input type="radio" class="form-control"
name="choice.id" id="text" value="${choice.id}" />${choice.text}
</label>
</c:forEach>
</div>
<input type="hidden" name="mcQuestion.id"
value="${mcQuestion.id}"/>
</div>
<button type="submit" class="btn btn-default">Add
Answer</button>
</div>
</div>
</form>
<hr />
<h2 class="text-center">Answers</h2>
<c:choose>
<c:when test="${not empty
mcQuestion.choiceAnswers}">
<table class="table table-striped">
<thead>
<tr style="font-size: 18px">
<th>
User
</th>
<th>
Answer
</th>
<sec:authorize
<th>
Manage
</th>
</sec:authorize>
</tr>

69 | P a g e
</thead>
<tbody>
<c:forEach var="choiceAnswer"
items="${mcQuestion.choiceAnswers}">
<tr>
${choiceAnswer.user.login}
</td>
${choiceAnswer.choice.text}
</td>
<sec:authorize
<a href="<c:url
value="/choiceAnswers/delete?answerId=${choiceAnswer.id}&questionId=$
{mcQuestion.id}"/>" >Delete</a>
</td>
</sec:authorize>
</tr>
</c:forEach>
</tbody>
</table>
</c:when>
<c:otherwise>
There are no answers
</c:otherwise>
</c:choose>

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8.5.2. create.jsp
<h2 class="text-center">Create multiple choice question for
form: ${form.title}</h2>
<p>
<form class="form-horizontal" role="mcQuestionWrapper"
name="mcQuestionWrapper" method="POST" action="<c:url
value="/mcQuestions/create"/>" >
name="mcQuestion.text" id="text" placeholder="Enter question"
autofocus>
<input type="hidden" name="mcQuestion.form.id"
value="${form.id}" />
<br/>
</div>
for="choices">Choices:</label>
<c:forEach
items="${mcQuestionWrapper.choices}" varStatus="i">
<input type="text" class="form-
control" name="choices" id="text" placeholder="Enter choice"/>
<br/>
</c:forEach>
</div>
</div>
</div>
</div>
</form>
The new thing here is that we are passing an MCQuestionWrapper to the controller,
instead of passing a model. This wrapper contains an MCQuestion and list of choices.
Making a wrapper class is a good strategy to pass multiple models to a controller.
Please notice that we are looping through the list of choices, because in the action of
the controller returned for us a list filled with objects of choices with no text, so we
loop through them to have text inputs with the same number of the objects contained.

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8.5.3. edit.jsp
<h2 class="text-center">Edit multiple choice question:
${mcQuestionWrapper.mcQuestion.text}</h2>
<p>
<form class="form-horizontal" role="mcQuestionWrapper"
name="mcQuestionWrapper" method="POST" action="<c:url
value="/mcQuestions/update"/>" >
name="mcQuestion.text" id="text" placeholder="Enter question"
value="${mcQuestionWrapper.mcQuestion.text}" autofocus>
<input type="hidden" name="mcQuestion.id"
value="${mcQuestionWrapper.mcQuestion.id}" />
<input type="hidden" name="mcQuestion.form.id"
value="${mcQuestionWrapper.mcQuestion.form.id}" />
<br/>
</div>
for="choices">Choices:</label>
<c:forEach
items="${mcQuestionWrapper.choices}" varStatus="i" var="choice">
<input type="text" class="form-
control" name="choices" id="text" placeholder="Enter choice"
value="${choice.text}"/>
<br/>
</c:forEach>
</div>
</div>
</div>
</div>
</form>

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9. Sample Screenshots

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10. Useful Resources
Spring Security Reference Documentation:
http://docs.spring.io/autorepo/docs/spring-security/3.1.x/reference/springsecurity-
single.html
Spring MVC: Security with MySQL and Hibernate:
http://fruzenshtein.com/spring-mvc-security-mysql-hibernate/
Spring AOP Error : Cannot proxy target class because CGLIB2 is not available:
http://www.mkyong.com/spring/spring-aop-error-cannot-proxy-target-class-because-
cglib2-is-not-available/
Implementing Inheritance in Hibernate (Single Table Strategy, With Table Per
Class Strategy, With Joined Strategy) : Chapter 22 | DOJ Software Consultant |
Dinesh on Java:
http://www.dineshonjava.com/p/implementing-inheritance-in-
hibernate.html#.VZuKlRuqqko
Handling entities inheritance with Spring Data JPA | Netgloo Blog:
http://blog.netgloo.com/2014/12/18/handling-entities-inheritance-with-spring-data-
jpa/
Hibernate JPA Cascade Types - HowToDoInJava:
http://howtodoinjava.com/2014/09/25/hibernate-jpa-cascade-types/
orm - JPA - Persisting a One to Many relationship - Stack Overflow:
http://stackoverflow.com/questions/1795649/jpa-persisting-a-one-to-many-
relationship
how to lazy load collection when using spring-data-jpa, with hibernate, from an
console application - Stack Overflow
http://stackoverflow.com/questions/14938748/how-to-lazy-load-collection-when-
using-spring-data-jpa-with-hibernate-from-an
java - Cannot fetch LAZY - JPA - Stack Overflow:
http://stackoverflow.com/questions/19304671/cannot-fetch-lazy-jpa

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