jDays - Spring Boot under the Hood
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The document provides an overview of Spring Boot, including its actuator features and configurations using XML dependencies for JPA and HSQLDB. It details various conditional annotations that influence bean creation and application behavior, emphasizing the importance of understanding auto-configuration. The document also mentions the potential for creating custom starters and includes links for further information.
![REMEMBER @PROFILE?
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface Profile {
String[] value();
}
@nicolas_frankel #springboot
16](https://image.slidesharecdn.com/5gsm06v0qnquqgcfgqp4-signature-be0e746662cf7649fefff57cfde55d39ed20ec6fa930761f73b90f61cd3c1a3b-poli-170307153204/85/jDays-Spring-Boot-under-the-Hood-16-320.jpg)
![THIS IS THE NEW @PROFILE
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE,
ElementType.METHOD})
@Documented
@Conditional(ProfileCondition.class)
public @interface Profile {
String[] value();
}
@nicolas_frankel #springboot
17](https://image.slidesharecdn.com/5gsm06v0qnquqgcfgqp4-signature-be0e746662cf7649fefff57cfde55d39ed20ec6fa930761f73b90f61cd3c1a3b-poli-170307153204/85/jDays-Spring-Boot-under-the-Hood-17-320.jpg)
jDays - Spring Boot under the Hood
- 2. ME, MYSELF AND I @nicolas_frankel #springboot 2 Developer/Software - /Solution Architect • Java • As consultant
- 3. HYBRIS, AN SAP COMPANY 3 @nicolas_frankel #springboot
- 7. /HEALTH { "status" : "UP", "diskSpace" : { "status" : "UP", "total" : 499055067136, "free" : 254812135424, "threshold" : 10485760 }, "db" : { "status" : "UP", "database" : "HSQL Database Engine", "hello" : 1 } } @nicolas_frankel #springboot 7
- 8. SPRING BOOT Works well until: • It doesn’t anymore • Or you want to change the default behavior @nicolas_frankel #springboot 8
- 9. THERE’S NO MAGIC INVOLVED @nicolas_frankel #springboot 9
- 14. @JPAREPOSITORIESAUTOCONFIGURATION @Configuration @ConditionalOnBean(DataSource.class) @ConditionalOnClass(JpaRepository.class) @ConditionalOnMissingBean({ JpaRepositoryFactoryBean.class, JpaRepositoryConfigExtension.class }) @ConditionalOnProperty( prefix = "spring.data.jpa.repositories", name = "enabled", havingValue = "true", matchIfMissing = true) @Import(JpaRepositoriesAutoConfigureRegistrar.class) @AutoConfigureAfter( HibernateJpaAutoConfiguration.class) public class JpaRepositoriesAutoConfiguration { } @nicolas_frankel #springboot 14
- 16. REMEMBER @PROFILE? @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.TYPE) public @interface Profile { String[] value(); } @nicolas_frankel #springboot 16
- 17. THIS IS THE NEW @PROFILE @Retention(RetentionPolicy.RUNTIME) @Target({ElementType.TYPE, ElementType.METHOD}) @Documented @Conditional(ProfileCondition.class) public @interface Profile { String[] value(); } @nicolas_frankel #springboot 17
- 18. @CONDITIONAL & CONDITION @nicolas_frankel #springboot 18
- 19. @CONDITIONAL & CONDITION Enables calling of a @Bean- annotated method • In the context of a @Configuration class @nicolas_frankel #springboot 19
- 21. OUT-OF-THE-BOX CONDITIONS Condition Description OnBeanCondition Checks if a bean is in the Spring factory OnClassCondition Checks if a class is on the classpath OnExpressionCondition Evalutates a SPeL expression OnJavaCondition Checks the version of Java OnJndiCondition Checks if a JNDI branch exists OnPropertyCondition Checks if a property exists OnResourceCondition Checks if a resource exists OnWebApplicationCondition Checks if a WebApplicationContext exists @nicolas_frankel #springboot 21
- 22. COMPOSITE CONDITIONS Condition Description AllNestedConditions AND condition AnyNestedConditions OR condition NoneNestedCondition NOT condition @nicolas_frankel #springboot 22
- 23. OUR OWN STARTER @nicolas_frankel #springboot 23
Editor's Notes
- #19: skinparam dpi 150 interface Conditional<T extends Condition><<(@,#A9DCDF)>> { value(): Class<T>[] } interface Condition { matches(context:ConditionContext, metadata:AnnotatedTypeMetadata):boolean } abstract class SpringBootCondition class ProfileCondition Conditional .down.> Condition SpringBootCondition .up.|> Condition ProfileCondition .up.|> Condition hide empty members hide empty attributes