Variable substitution issue with the Arrivals Thread Group

[ben.p...@xoom.com]

I'm seeing an issue when I try to use the Arrivals Thread Group with variables.  Instead of parsing the variable substitution, it looks like it's trying to interpret the variable substitution string as a number, so JMeter is throwing a number format exception.

In the attached example, I have two thread groups.  One uses the Arrivals Thread Group, and the other uses a standard JMeter thread group.  Both use the substitution string ${ramp_up_time_seconds} for one of the fields.  The standard thread group accepts the variable, but the Arrivals one doesn't parse it correctly.

I'm using JMeter 3.0.

Here's the exception:

2016/09/09 13:56:11 ERROR - jmeter.JMeter: Uncaught exception:  java.lang.NumberFormatException: For input string: "${ramp_up_time_seconds}"

        at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)

        at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)

        at java.lang.Double.parseDouble(Double.java:538)

        at com.blazemeter.jmeter.threads.AbstractDynamicThreadGroupModel.getRampUpSeconds(AbstractDynamicThreadGroupModel.java:110)

        at com.blazemeter.jmeter.threads.arrivals.ArrivalsThreadStarter.getCurrentRate(ArrivalsThreadStarter.java:69)

        at com.blazemeter.jmeter.threads.arrivals.ArrivalsThreadStarter.needMoreArrivals(ArrivalsThreadStarter.java:49)

        at com.blazemeter.jmeter.threads.arrivals.ArrivalsThreadStarter.supplyActiveThreads(ArrivalsThreadStarter.java:22)

        at com.blazemeter.jmeter.threads.AbstractThreadStarter.run(AbstractThreadStarter.java:42)

Any insights?

Thanks,

Ben

[Andrey Pokhilko]

In JMeter, you cannot use variables in Thread Groups. Because variables belong to threads, but threads are summoned by Thread Groups, thus variables not exist when Thread Group settings are processed.

Use jmeter properties instead.

Andrey Pokhilko

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