JMeter Post-Processors

JMETER PROCESSORS
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JMeter Processors are utilized to transform the
Samplers in their scope. There are two types of
processors in JMeter as JMeter Post-processors
and JMeter Pre-processors. In this presentation,
we’ll go through post-processors.
JMeter Post-processors are taking actions after
the Sampler is done with its request. You can get
the response or gather data into a variable for
later use. It is up to your scenario.

JMETER POST-
PROCESSORS
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 Regular Expression Extractor,
 CSS/jQuery Extractor,
 xPath Extractor,
 Result Status Action Handler,
 BeanShell Post-processor,
 JSR223 Post-processor,
 JDBC Post-processor,
 JSON Extractor,
 Boundary Extractor

REGULAR EXPRESSION
EXTRACTOR
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Regular Expression Extractor is one of the most
helpful JMeter Post-processors in pattern
matching. We are using it for the matching pattern
on contents, values, and expression. The use of
the regular expression is to extract the data from
the responses in JMeter. It is also used in
capturing dynamic value from the response.
For example, If we want to extract dynamic value
from the Google page, the regular expression
extractor plays its role from extracting that
information from the page.

REGULAR EXPRESSION
EXTRACTOR
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Refer to below steps for Regular Expression
Extractor:
 Go to Thread Group
 Add new Sampler
 Right-click on Sampler
 Click on Add
 Click on Post Processors
 Click on Regular Expression Extractor

REGULAR EXPRESSION
EXTRACTOR
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REGULAR EXPRESSION
EXTRACTOR
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Now you can find below control-panel with
following fields;
 Apply to: It defines where you can apply
extractor.
 The possibilities are
 Main sample and sub-samples
 Main sample only
 Sub-samples only
 JMeter Variable

REGULAR EXPRESSION
EXTRACTOR
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Field to check: It defines the field of the sampler,
which has to be check.
The possibilities are
 Body
 Body (Escaped)
 Body as a Document
 Response Headers
 Request Headers
 URL
 Response Code
 Response message

REGULAR EXPRESSION
EXTRACTOR
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 Reference name: Variable name where results
need to be saved.
 Regular Expression: It is a sequence of
characters that defines the search pattern
 Template: It is used to create the string from
the found matches.
 Match: It identifies which matches we can use
for the further process.
 Default value: When the regex does not
match, in such case variable will be set to the
default value.

REGULAR EXPRESSION
EXTRACTOR
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CSS/JQUERY
EXTRACTOR
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CSS/jQuery Extractor is used to extract the values
from the response. It uses pre-defined syntax for
extracting the element’s value from the web page
and then storing same values into created
variables. Moreover, this extractor can be used
with the request for extracting matching values
from the responses.
For example; You can use the commonly-
accepted syntax of CSS/jQuery extractor for
extracting elements value from any Google web
page and then can store that value in a created
variable. Now you can use that variable name in
next HTTP Request with the Path field for visiting
the link which is stored in the created variable.

CSS/JQUERY
EXTRACTOR
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Here you can find steps:
 Add new Sampler
 Click on Add
 Click on CSS/jQuery Extractor

CSS/JQUERY
EXTRACTOR
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Now you are able to find below control-panel of
CSS/jQuery Extractor
 Apply To: This can be useful to define matches
need to apply on which sample
 The possibilities are
 JMeter Variable

CSS/JQUERY
EXTRACTOR
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 CSS/jQuery Extractor Implementation: It supports
these two: (“JSoup(default)” and “Jodd-Lagarto”)
and if the selector is set to empty, the default
implementation will be used.
 Reference Name: Name of the variable where the
result will store.
 CSS/jQuery Expression: It is a selector which uses
pre-defined syntax for extracting element values.
 Attribute: It specifies the attribute of the element
that needs to be extracted with the help of a
selector.
 Match No. (0 for Random): It indicates which match
needs to be used.
 Default value: Reference variable will be set to the
default value if no match found.

XPATH EXTRACTOR
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XPath Extractor comes into play when Regular
expression extractor is not able to extract the
information. To use this XPath Extractor, first of all,
you need to add it to the Request sampler. And now
can use XPath Tester to extract any value from HTML
response and validate same value using XPath
extractor.
For example, you want to validate the title of Google
homepage, now extract the value of title from Sampler
response using XPath Tester and then store it using
Reference name. Now can validate the title using
XPath extractor.

XPATH EXTRACTOR
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Having difficulty with the extraction of information?
Don’t worry be happy and follow the below steps:
 Add new Sampler
 Click on Add
 Click on Post Processor
 Click on XPath Extractor

XPATH EXTRACTOR
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Now you can see below Control-Panel with following
fields:
 Reference Name: JMeter variable name in which
result will be stored.
 XPath Query: You can understand it as element
query in XPath language and can return more than
one match.
 Default Value: It returned when no match found. It
is also returned when the node has no value and
fragment option is not selected.

RESULT STATUS ACTION
HANDLER
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Result Status Action Handler allows the user to stop
the thread or whole test according to sampler result.
You have different choices here, and of course, you
can choose from these, action be taken if in any case
there is sampler error and this error can happen
because of sample failed itself or assertion failed.
For example, you use assertion of 200 response code
but because of slow internet connection Google page
is not able to load and got other numbers in response
code, and you have used “Stop Thread” option, now
test will stop here itself with the failed result.

HANDLER
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Want to apply constraints for your sampler? Here you
go:
 Add new Sampler
 Click on Add
 Click on Result Status Action Handler

HANDLER
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Now you can find below Control-Panel with following
possible choices;
 Continue: This option ignores the error and
continues the test.
 Start next thread loop: It does not execute the test
for current iteration when it found an error and
restarts the loop on next iteration.
 Stop Thread: In this option current thread exits.
 Stop Test: In this option, the whole test is stopped
at the end of any current sample.
 Stop Test Now: The entire test is stopped here.
Any current samplers are interrupted if possible.

HANDLER
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The BeanShell PostProcessor are mainly used in
sorting purpose and removing all the unwanted
characters like ‘[]’ and ‘,’. This post-processor will act
as a filter for you.
Want to use this filter at your end? Then please follow
below path:
 Add new Sampler
 Click on Add
 Click on BeanShell PostProcessor

BEANSHELL
POSTPROCESSOR
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Now after adding BeanShell PostProcessor, I will
name this PostProcessor as ‘Login Filter’. Here at
BeanShell Control-panel, you can see that the script
field contains the code that helps in removing the
unwanted characters from a string.
This string was stored as response data by the Login
sampler. Now I will fetch the string from login sampler
using the function getResponseDataAsString() of the
prev variable. Next, I will use the replace() method of
the String class to remove ‘[]’ and ‘,’ characters from
the string.
Now, will store the filtered string in the “vars” variable
and print this final string value.

JSON EXTRACTOR
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JSON Extractor in Jmeter helps you to use the JSON-
PATH syntax to extract data from JSON
responses. This post-processor is very much similar to
Regular Expression Extractor.
You need to use this post-processor with Sampler that
has a response. It is one of the very easy ways to
extractor from text content. You can extract
conditional data and multiple data as well with the help
of this extractor.
For Example, you can extractor multiple values from a
single document using JSONPath syntax, now
suppose you want to extract all cites name from
Historical Places web page, and here you can use
JSONPath syntax to extract all the values and can
store it in the created variable.

JSON EXTRACTOR
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Want to try it with your sampler? Then follow me:
 Add new Sampler
 Right click on Sampler
 Click on Add
 Click on JSON Extractor

JSON EXTRACTOR
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Now, you can see below Control Panel with the
following fields;
Apply To: This can be useful to define matches need
to apply on which sample.
The possibilities are:
 JMeter Variable

JSON EXTRACTOR
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 Variable names: Name of the variable where the
result will store.
 JSON Path expressions: Expressions which were
used to extract content from the response.
 Match No. (0 for Random): It indicates which match
needs to be used.
 Compute concatenation var (suffix_ALL): It is used
for the concatenation of all extracted values.
 Default value: Reference variable will be set to the
default value if no match found.

BOUNDARY EXTRACTOR
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The Boundary extractor allows you to extract values
from server response with the help of left and right
boundaries.
Like all other post-processors, this will also execute
after Sampler in its scope, it will test the boundaries
and then extract the requested values, after this, it will
store the value in the given variable name.
For example, you want to extract cites name from
Historical Places web page, and you know that city
name data surrounded by ‘city:{’ from the left and ‘}’
from the right, so these values need to use in left and
right boundaries. And extracted values will store in a
created variable.

BOUNDARY EXTRACTOR
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Here are the steps that will help you with the process
of adding Boundary Extractor:
 Add new Sampler
 Click on Add
 Click on Boundary Extractor

PARAMETERS
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 Name: It is the name of an element that will display
in the tree.
 Apply to: It defines match needs to apply on which
sample.
 Field to Check: It defines the part of the response,
which needs to be checked.
 Name of the created variable: The name of the
variable in which the result is going to store.

PARAMETERS
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 Left Boundary: Here you can define the left
boundary value for the string.
 Right Boundary: Here you can define the right
boundary value for the string.
 Match No. (0 for Random): It defines which match
to use.
 Default Value: It defines the value which needs to
be set if no match found.

JSR223 POST-PROCESSOR
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JSR223 PostProcessor allows you to apply JSR223
script code after taking a sample. Scripts here have
already compiled and it brings significant performance
boost.
Before invoking the script, some variables are already
set so, that it can be used directly.
It allows more control over on how extraction took
place from the response and how it going to store in
variables.

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For example, you want to extract value from the
response or from User Defined Variable, now you
need to use:
vars.get(“variable_name”);
//to read or get variable
def var = vars.get(“variable_name”);
//to store value in variable
vars.put(“my_var”, var);
//to display value

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Reach out here to use this post-processor:
 Add new Sampler
 Click on Add
 Click on JSR223 PostProcessor

JDBC POSTPROCESSOR
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JDBC Post-processor enables you to run SQL
statements just after a sample has run. It can be
helpful for you to execute queries against any table for
getting the required information and also helpful in
case JDBC Sample changes some data during
sample run and you want to restore the state.
For example, you want to fetch some data from a
table, now select Query Type as “Select Statement”
and write SQL Query in Query field. And also enter all
variable name in “Variable names” field so that it can
return data with respect variable names. You can also
enter multiple variable names separated by a comma.

JDBC POSTPROCESSOR
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You can find below steps for adding this
PostProcessor in your sampler.
 Add new Sampler
 Right Click on Sampler
 Click on Add
 Click on JDBC PostProcessor

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Hope this article will be helpful for you!
You can also try our lovely product Loadium.
Stay tuned!
THANK YOU

JMeter Post-Processors

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