Andreas Weise created ZEPPELIN-3241:
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             Summary: NPE when restarting Interpreter
                 Key: ZEPPELIN-3241
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-3241
             Project: Zeppelin
          Issue Type: Bug
          Components: zeppelin-zengine
    Affects Versions: 0.8.0, 0.9.0
            Reporter: Andreas Weise


We often (not always) face NPE when restarting Spark Interpreter, which runs in 
scoped mode per note.
{noformat}
Caused by: java.lang.NullPointerException
at org.apache.zeppelin.notebook.Paragraph.clearRuntimeInfo(Paragraph.java:732)
at 
org.apache.zeppelin.socket.NotebookServer.clearParagraphRuntimeInfo(NotebookServer.java:2558)
at 
org.apache.zeppelin.rest.InterpreterRestApi.restartSetting(InterpreterRestApi.java:192)
at sun.reflect.GeneratedMethodAccessor58.invoke(Unknown Source)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
{noformat}



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