JMeter - Set a dynamic variable for Loop Controller

Question

I have the following Setup:

| Thread Group
| -- BeanShell PreProcessor
| -- Loop Controller

In The BeanShell PreProcessor I have:

vars.put("myDynamicNumber", someDynamicallyGeneratedNumber+"");

In The Loop Controller I have:

Loop Count: ${myDynamicNumber}

I was under the impression this would work. Instead the Loop Controller cannot find the variable. Am I doing something incorrectly?

It looks like I solved it by switching from BeanShell PreProcessor to BeanShell Sampler — user2992188
– user2992188, Commented Dec 18, 2013 at 13:25
...As well it looks like any PreProcessor component should be added as CHILD to the control BEFORE which one you would like to execute processing. — Aliaksandr Belik
– Aliaksandr Belik, Commented Dec 18, 2013 at 17:09

Dmitri T · Accepted Answer · 2013-12-19 08:15:38Z

2

You need to use Beanshell Sampler, not Beanshell Pre-Processor.

I don't know why does JMeter allow putting Beanshell Pre-Processor at the same level as loop controller, it should go as a child of i.e. HTTP Request.

I'd also suggest to slightly change your code to be:

vars.put("myDynamicNumber", String.valueOf(someDynamicallyGeneratedNumber));

Which is more correct from Beanshell perspective.

answered Dec 19, 2013 at 8:15

Dmitri T

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