JMeter use variable array values individually

Question

I am struggling a bit to make use of a variable created using the Json extractor, I have extracted all the ID's from a response and want to cycle through them individually across the threads.

Thread 1 would use id_1 and thread 2 would use id_2 etc.

I have tried using a ForEach controller but it's cycling through the whole set for each thread.

Test runs like this:

Generate access token
Get parameters - Extract the list of ID's here.
Update parameter - Pass the ID individually here per thread.

Is there a way to achieve this?

Dmitri T · Accepted Answer · 2022-03-04 08:29:52Z

1

You won't be able to do this because as per documentation:

Properties are not the same as variables. Variables are local to a thread; properties are common to all threads, and need to be referenced using the __P or __property function.

So if you want to perform extraction using one thread and then hit everything using multiple threads you can either convert all the variables which start with id_ to JMeter Properties using the following Groovy code snippet:

vars.entrySet().each { variable ->
    if (variable.getKey().startsWith('id_')) {
        props.put(variable.getKey(), variable.getValue())
    }
}

and then you will be able to access the properties using __P() function like:

${__P(id_${__threadNum},)}

answered Mar 4, 2022 at 8:29

Dmitri T

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1 Comment

Noel F Over a year ago

Thanks Dmitri, this has resolved my issue and will make my test much more flexible. I am new to JMeter so still learning.

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