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java.lang.ThreadGroup:uncaughtException when calling Window#synchronizeComponents() in the wrong thread

Exception in thread "AWT-EventQueue-0" [21:24:50] [AWT-EventQueue-0/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException ...
GitHub

Couldn't destroy threadgroup org.codehaus.mojo.exec.ExecJavaMojo$IsolatedThreadGroup (2.2.0)

I've a small "testing" application (source code below) and eveything works fine with 2.1.0 (names are printed out) but it fails ...
InfoWorld

Java 101: Understanding Java threads, Part 4: Thread groups, volatility, and thread-local variables

This month’s Java 101 concludes the thread series by focusing on thread groups, volatility, thread-local variables, timers, and ...
findnerd.com

ThreadGroup Class

It represents combination of threads within a group. A thread group can also include other thread groups .With the help of thread ...