JMeter bzm - Parallel Controller class java.util.IdentityHashMap cannot be cast to class java.util.HashMap exception

Question

I am using jmeter 5.6.2 and Java java version 17.0.8 2023-07-18 LTS Java(TM) SE Runtime Environment (build 17.0.8+9-LTS-211) Java HotSpot(TM) 64-Bit Server VM (build 17.0.8+9-LTS-211, mixed mode, sharing)

After adding bzm - Parallel Controller to my thread group I faced this exception:

ERROR o.a.j.t.JMeterThread: Error while processing sampler: 'bzm - Parallel Controller'.
java.lang.ClassCastException: class java.util.IdentityHashMap cannot be cast to class java.util.HashMap (java.util.IdentityHashMap and java.util.HashMap are in module java.base of loader 'bootstrap')
    at com.blazemeter.jmeter.controller.JMeterThreadParallel.cloneTestCompiler(JMeterThreadParallel.java:45) ~[jmeter-parallel-0.11.jar:?]
    at com.blazemeter.jmeter.controller.JMeterThreadParallel.copyCompilerFromParent(JMeterThreadParallel.java:36) ~[jmeter-parallel-0.11.jar:?]
    at com.blazemeter.jmeter.controller.JMeterThreadParallel.<init>(JMeterThreadParallel.java:26) ~[jmeter-parallel-0.11.jar:?]
    at com.blazemeter.jmeter.controller.ParallelSampler.sample(ParallelSampler.java:71) ~[jmeter-parallel-0.11.jar:?]
    at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:651) ~[ApacheJMeter_core.jar:5.6.2]
    at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:570) ~[ApacheJMeter_core.jar:5.6.2]
    at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:501) [ApacheJMeter_core.jar:5.6.2]
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:268) [ApacheJMeter_core.jar:5.6.2]
    at java.lang.Thread.run(Thread.java:833) [?:?]

Exception

Any ideas how to fix this?

thanks

Tried different java versions but this didn't help.

Answer 1

JMeter API似乎发生了一些重大变化，因此Parallel Controller 0.11只能与JMeter 5.5或更低版本一起使用。

您需要降级您的 JMeter 版本。

或者，此票证中有一个解决方法