Github user Leemoonsoo commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/534#issuecomment-166614398
Following error is thrown when persisting changes of notebook which loaded
on Zeppelin startup (not created after start up)
```
java.lang.NullPointerException
at org.apache.zeppelin.notebook.Note.persist(Note.java:380)
at
org.apache.zeppelin.socket.NotebookServer.updateParagraph(NotebookServer.java:451)
at
org.apache.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:123)
at
org.apache.zeppelin.socket.NotebookSocket.onMessage(NotebookSocket.java:56)
at
org.eclipse.jetty.websocket.WebSocketConnectionRFC6455$WSFrameHandler.onFrame(WebSocketConnectionRFC6455.java:835)
at
org.eclipse.jetty.websocket.WebSocketParserRFC6455.parseNext(WebSocketParserRFC6455.java:349)
at
org.eclipse.jetty.websocket.WebSocketConnectionRFC6455.handle(WebSocketConnectionRFC6455.java:225)
at
org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
at
org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:745)
```
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