I am using two JSR223 preprocessors,in which I want to use variable from one preprocessor into another preprocessor.
how can I use this in Jmeter??
Please assist me with an example.
In the first PreProcessor store some value into a foo JMeter Variable using vars shorthand for JMeterVariables class instance like:
vars.put('foo', 'some value')
In the second PreProcessor you can read the value using the same vars shorthand like:
String myString = vars.get('foo')
See Top 8 JMeter Java Classes You Should Be Using with Groovy article for more information on this vars shorthand and other JMeter API shortcuts available for the JSR223 Test Elements
The variable can be seen using Debug Sampler and View Results Tree listener combination.
Related
When I use the command ${__jm__myLoopControllerName__idx} in JSR223 Sampler, it always returns 0 as the index.
The sampler is in the Loop Controller. But I can see that the CSV file I'm looping is done for each line because in the listener "View Result Tree" I can see in the Request Headers, that the data is from each line. What am I doing wrong ?
Thanks for your help.
M.
Use vars to get variable in JSR223 script:
String index = vars.get("__jm__myLoopControllerName__idx");
variable inside ${} syntax is getting cached
ensure the script does not use any variable using ${varName} as caching would take only first value of ${varName}. Instead use : vars.get("varName")
As per JSR223 Sampler documentation:
The JSR223 test elements have a feature (compilation) that can significantly increase performance. To benefit from this feature:
Use Script files instead of inlining them. This will make JMeter compile them if this feature is available on ScriptEngine and cache them.
Or Use Script Text and check Cache compiled script if available property.>
When using this feature, ensure your script code does not use JMeter variables or JMeter function calls directly in script code as caching would only cache first replacement. Instead use script parameters.
So either put your ${__jm__myLoopControllerName__idx} to "Parameters" section and refer it as "Parameters" in your script:
or use vars shorthand for JMeterVariables class instance like:
vars.get('__jm__myLoopControllerName__idx')
I am using BeanShell assertion to passing value to next thread group. Now I wanted to use that value in next thread group. I am using set Property function and I can see in logs those values stored in variable.
Given you set some property value via __setProperty() function like:
${__setProperty(foo,bar,)}
you can read it using __P() function like:
${__P(foo,)}
If you want to fetch the value in a script - you can use props shorthand like:
String myValue = props.get("foo");
Also be aware that starting from JMeter 3.1 you should be using JSR223 Test Elements and Groovy language for scripting so consider migrating to JSR223 Assertion. If you're setting the property value from the script - don't inline JMeter Function, use the aforementioned props shorthand instead like:
props.put("foo", "bar"); // this creates "foo" property with the value of "bar"
You should be able to re-use the same code. Check out The Groovy Templates Cheat Sheet for JMeter article which covers your use case in particular and few more common tasks in general for more details.
I have an http request that uses an extractor to set a JMeter variable (lets call it test) from the body. When I look at the debug controller I can see this works fine. Next I want to append something to the beginning of the variable so I add a user defined variable node and add a variable with the name new and I set the value to ${test}. However when I look in the debug response I see ${test} instead of the value.
I tried the same thing setting the value manually in 2 different UDV nodes and it works fine, so how do I append to a JMeter variable declared in an extractor?
As per JMeter Documentation:
The User Defined Variables element lets you define an initial set of variables, just as in the Test Plan.
Note that all the UDV elements in a test plan - no matter where they are - are processed at the start.
So the User Defined Variables element will be read only once and only when the Test Plan is started.
If you need to overwrite the current variable with a new value you can go for i.e. __groovy() function, the relevant syntax would be something like:
${__groovy(vars.put('foo'\, 'some_prefix_' + vars.get('foo')),)}
Demo:
vars is a shorthand for JMeterVariables class instance, it provides read-write access to all JMeter Variables in the current thread scope. Check out The Groovy Templates Cheat Sheet for JMeter to learn what else you can do with Groovy scripting in JMeter tests
UDVs can't be used in dynamic way because they are process once at the start of the test.
Don't use UDV, use JSR223 Sampler (or PostProcessor) with vars;
vars.put("new", "prefix"+ vars.get("test"))
Another option is to use Set Variables Action plugin
I'm new to JMeter BeanShell PreProcessor function.
For a test I'm trying to print sample URL address.
From the tutorial I have the follownig code:
org.apache.jmeter.samplers.SampleResult;
String currentURL = SampleResult.getUrlAsString();
print(currentURL)
But I get error "Attempt to resolve method: getUrlAsString() on undefined variable", how to define this variable first?
This means the SampleResult does not exist.
You need to use prev as per this doc:
http://jmeter.apache.org/usermanual/component_reference.html#BeanShell_PreProcessor
Which references this javadoc:
http://jmeter.apache.org/api/org/apache/jmeter/samplers/SampleResult.html#getUrlAsString--
Be aware that since JMeter 3.1 it is recommended to use JSR223 Test Elements and Groovy language for any form of scripting in JMeter tests. So consider migrating to Groovy as soon as possible.
If you are using a PreProcessor it means that you don't have any SampleResult as sampler has not been yet executed. So you need to use sampler shorthand which is resolved into HTTPSamplerProxy like:
sampler.getUrl() as String
Demo:
More information: Apache Groovy - Why and How You Should Use It
I'm finding the way to use the variable sampler in JSR223 Sampler, JSR223 PreProcessor, JSR223 PostProcessor, and all other JSR223 script.
There are some other variables like vars, props, prev, SampleResult. I can use them easily.
For example:
vars: vars.get("VARIABLE_NAME"), vars.put("VARIABLE_NAME","VALUE"), ...
props: props.get, props.put, ...
prev: prev.getTime(), prev.isSuccessful(), prev.getLatency(), ...
SampleResult: SampleResult.getResponseCode(), SampleResult.getResponseMessage(), ...
But I don't know how to use variable sampler. Only thing I can do with this variable is:
sampler.sample(): It helps to returns the Name of current Sampler
So, could anyome please let me know there is any other way to use this variable?
Thanks in advance!
For JSR223 Sampler sampler variable stands for JSR223Sampler, see the JavaDoc for all available methods and fields.
When it comes to JSR223 Pre or Post Processor - in that case sampler variable stands for parent sampler class instance, for instance in case of HTTP Request it will be HTTPSamplerProxy, for JDBC Request - it will be JDBCSampler and so on.
You can check exact class using Groovy expression like:
log.info(sampler.getClass().getName())
You can check How to Use BeanShell: JMeter's Favorite Built-in Component guide for more information on pre-defined variables and their usage. It is applicable for Groovy as well.
sampler is a Sampler object. you can use whatever the methods available here, not only methods declared in Sampler class but also the methods in super classes/interfaces like TestElement.
For example:
sampler.sample() - returns sampler's name
sampler.setProperty() - set a property by specifying key, value
sampler.setThreadName() - set thread name for the sampler.