Kwon, Yeong-Eon a4f19148aa Prevent NullPointerException if "gatewayServer" does not exist ... ### What is this PR for? Avoiding and preventing undesired NullPointerException during re-loading python interpreter Since py4j is optional when PythonInterpreter starts, it should be optional too while it close. ### What type of PR is it? [Improvement] ### What is the Jira issue? * N/A ### How should this be tested? Reload PythongInterpreter on Zeppelin web "Interpreter" menu and check the log message if it complains NullPointerException ### Screenshots (if appropriate) ### Questions: * Does the licenses files need update? no * Is there breaking changes for older versions? no * Does this needs documentation? no Author: Kwon, Yeong-Eon <happylogin@gmail.com> Author: Y.E. Kwon <OutOfBedlam@users.noreply.github.com> Closes #1009 from OutOfBedlam/python and squashes the following commits: 5ed2413 [Y.E. Kwon] Fix code style ccbf7ef [Kwon, Yeong-Eon] Prevent NullPointerException if "gatewayServer" does not exist		2016-06-15 15:56:46 +09:00
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main	Prevent NullPointerException if "gatewayServer" does not exist	2016-06-15 15:56:46 +09:00
test/java/org/apache/zeppelin/python	[ZEPPELIN-502] Python interpreter group	2016-05-31 23:34:05 +09:00