zjffdu opened a new pull request #3696: [ZEPPELIN-4692]. zeppelin pyspark doesn't print java output URL: https://github.com/apache/zeppelin/pull/3696 ### 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
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