TestJcmd.java gives only 5 second for container to be launched. But is it's often not enough.
The test fails with the following call call stack

java.util.concurrent.TimeoutException
        at com.oracle.java.testlibrary.ProcessTools.startProcess(ProcessTools.java:151)
        at TestJcmd.startObservedContainer(TestJcmd.java:183)
        at TestJcmd.main(TestJcmd.java:79)


We might need to increase the timeout (.e.g. to 15s).