1

I have a session variable and I want to use an If Controller to check if it is null and run a request to grab a new one if it is. I tried a few things...

"${session}" == "\${session}"
"${session}".length > 0

But none seem to work.

How do I check if a variable is set using an If Controller

2

You may try '${__javaScript(vars.get("session") != null)}

Please see the link for more detailed information.

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1

Since JMeter 4.0 you can use __isVarDefined() function which returns true if the JMeter Variable is defined (not null) and false otherwise

Demo:

JMeter isVarDefined Demo

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  • can u show a sample usage ? , I have tried "${__isVarDefined(variableName}}" but not works. – Samet Baskıcı Feb 6 '19 at 21:19

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