Jeff Zhang 6cdcc5b012 [ZEPPELIN-4692]. zeppelin pyspark doesn't print java output ... ### What is this PR for? The root cause of this issue is that we didn't redirect java output to interpreter output. This PR fix it via redirect java output before interpreting python code in both PySparkInterpreter & IPySparkInterpreter. Unit test is also added to verify this feature. ### What type of PR is it? [Bug Fix] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4692 ### How should this be tested? * Unit test is added, also manually tested it ### 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: Jeff Zhang <zjffdu@apache.org> Closes #3696 from zjffdu/ZEPPELIN-4692 and squashes the following commits: e1a5ead7e [Jeff Zhang] [ZEPPELIN-4692]. zeppelin pyspark doesn't print java output		2020-03-30 11:44:51 +08:00
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main	[ZEPPELIN-4686] Update commons-lang to commons-lang3	2020-03-19 22:21:13 +08:00
test	[ZEPPELIN-4692]. zeppelin pyspark doesn't print java output	2020-03-30 11:44:51 +08:00