Issue2537

It appears that test_java_integration hangs sometimes, when launched by 'ant regrtest'.
This is likely related to http://bugs.jython.org/issue2536, however
jstack output (attached) is different in this case. It doesn't detect a deadlock, but still test_java_integration hangs indefinitely.

However there are some similarities to jstack output of http://bugs.jython.org/issue2536:

- sun.misc.Unsafe.park is involved
- java.util.concurrent.locks.ReentrantLock$NonfairSync is involved
- Jython-Netty-Client is involved

Meanwhile I also observed a rather similar behavior happening in test_pythoninterpreter_jy.
jstack output attached.

I'm not seeing it hang, that I recall: it produces a warning:

dist\bin\jython Lib\test\test_java_integration.py
test_issue1833 (__main__.BeanPropertyTest) ... ok
test_awt_hack (__main__.BeanTest) ... ok

...

test_nonexistent_import_with_security (__main__.SecurityManagerTest) ... console: Failed to install 'org.python.util.JLineConsole': java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "readFileDescriptor").
ok

...

The occurs in the same test function as your jstack MainThread seems to be in.

This issue has most likely common cause with #2536.
#2536 was (empirically) solved as a consequence of
https://hg.python.org/jython/rev/17e40de9a541
A detailed fix of #2536 is of low priority.
So closing this issue as duplicate of #2536.

Reopen, if this issue pops up again even after https://hg.python.org/jython/rev/17e40de9a541.