mwasplund opened a new issue, #5759:
URL: https://github.com/apache/jmeter/issues/5759
### Expected behavior
Using new Open Model Thread Group throws exception when there are lot of
threads to hit the target RPS value.
### Actual behavior
```
2023-01-09 22:38:03,363 ERROR o.a.j.t.JMeterThread: Test failed!
java.lang.ClassCastException:
org.apache.jmeter.threads.openmodel.OpenModelThreadGroupController cannot be
cast to org.apache.jmeter.control.LoopController
at
org.apache.jmeter.threads.AbstractThreadGroup.startNextLoop(AbstractThreadGroup.java:171)
~[ApacheJMeter_core.jar:5.5]
at
org.apache.jmeter.threads.JMeterThread.continueOnThreadLoop(JMeterThread.java:434)
~[ApacheJMeter_core.jar:5.5]
at
org.apache.jmeter.threads.JMeterThread.triggerLoopLogicalActionOnParentControllers(JMeterThread.java:372)
~[ApacheJMeter_core.jar:5.5]
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:282)
~[ApacheJMeter_core.jar:5.5]
at
org.apache.jmeter.threads.openmodel.OpenModelThreadGroup$ThreadsStarter.run$lambda-0(OpenModelThreadGroup.kt:128)
~[ApacheJMeter_core.jar:5.5]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
~[?:1.8.0_351]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_351]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
~[?:1.8.0_351]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
~[?:1.8.0_351]
at java.lang.Thread.run(Unknown Source) ~[?:1.8.0_351]
2023-01-09 22:38:03,363 INFO o.a.j.t.JMeterThread: Thread finished: Open
Model Thread Group 1-248678
```
### Steps to reproduce the problem
Note: Repro is on our internal service that cannot be shared here. Hopefully
this is enough info.
* Create new test plan with Open Model Thread Group.
* Set target RPS to a value that will create heavy load
* As the threads increase over time it works fine until it hits a peak
concurrent load that starts to throw the above exception.
### JMeter Version
5.5
### Java Version
java version "1.8.0_351" Java(TM) SE Runtime Environment (build
1.8.0_351-b10) Java HotSpot(TM) 64-Bit Server VM (build 25.351-b10, mixed mode)
### OS Version
Windows 11 22621.963
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