Hi, Prasanta.
I think that the suspicious place in the stack is below, it tries to execute hooks during system shutdown and hangs.

The hook which hangs is "ToolkitShutdown #18 daemon" from the WToolkit class. I guess that the code which hangs is a loop in the:
    while (!tk.IsDisposed()) {

So it does not look like a test bug.

On 13/02/2018 22:38, Prasanta Sadhukhan wrote:
"main" #1 prio=5 os_prio=0 tid=0x000001b83d8ad000 nid=0x3e84 in Object.wait()  [0x0000003e642fe000]
    java.lang.Thread.State: WAITING (on object monitor)
     at java.lang.Object.wait(java.base@10-ea/Native Method)
     - waiting on <0x00000006d2880200> (a java.lang.Thread)
     at java.lang.Thread.join(java.base@10-ea/Thread.java:1353)
    - waiting to re-lock in wait() <0x00000006d2880200> (a java.lang.Thread)
     at java.lang.Thread.join(java.base@10-ea/Thread.java:1427)
    at java.lang.ApplicationShutdownHooks.runHooks(java.base@10-ea/ApplicationShutdownHooks.java:107)     at java.lang.ApplicationShutdownHooks$1.run(java.base@10-ea/ApplicationShutdownHooks.java:46)
     at java.lang.Shutdown.runHooks(java.base@10-ea/Shutdown.java:123)
     at java.lang.Shutdown.sequence(java.base@10-ea/Shutdown.java:167)
     at java.lang.Shutdown.exit(java.base@10-ea/Shutdown.java:212)

Best regards, Sergey.

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