[jira] [Created] (ZEPPELIN-4199) Class Cast Exception happens in starting Markdown Interpreter

[Zhefeng Wang (JIRA)]

Zhefeng Wang created ZEPPELIN-4199:
--------------------------------------

             Summary: Class Cast Exception happens in starting Markdown 
Interpreter 
                 Key: ZEPPELIN-4199
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-4199
             Project: Zeppelin
          Issue Type: Bug
    Affects Versions: 0.8.0
            Reporter: Zhefeng Wang


I try to use our company inner zeppelin and error happened in starting markdown 
interpreter. I find error in zeppelin log：
{code:java}
ERROR [2019-06-17 20:57:58,058] ({qtp1915058446-30489} 
NotebookServer.java[onMessage]:360) - Can't handle message: 
{"op":"RUN_PARAGRAPH","data":{"id":"2
0190617-205409_368254410","paragraph":"%md\nLivy\n","config":{"colWidth":12,"fontSize":9,"enabled":true,"results":{},"editorSetting":{"language":"text",
"editOnDblClick":false},"editorMode":"ace/mode/text"},"params":{}},"principal":"admin","ticket":"51c1f049-724b-4a05-ac4d-0afc20dc520a","roles":"[admin]"
}
java.lang.ClassCastException: com.google.gson.internal.StringMap cannot be cast 
to org.apache.zeppelin.interpreter.InterpreterProperty
        at 
org.apache.zeppelin.interpreter.InterpreterSetting.getJavaProperties(InterpreterSetting.java:470)
        at 
org.apache.zeppelin.interpreter.InterpreterSetting.createInterpreters(InterpreterSetting.java:630)
        at 
org.apache.zeppelin.interpreter.ManagedInterpreterGroup.getOrCreateSession(ManagedInterpreterGroup.java:132)
        at 
org.apache.zeppelin.interpreter.InterpreterSetting.getOrCreateSession(InterpreterSetting.java:660)
        at 
org.apache.zeppelin.interpreter.InterpreterSetting.getInterpreter(InterpreterSetting.java:675)
        at 
org.apache.zeppelin.interpreter.InterpreterFactory.getInterpreter(InterpreterFactory.java:87)
        at 
org.apache.zeppelin.notebook.Paragraph.isValidInterpreter(Paragraph.java:746)
        at org.apache.zeppelin.notebook.Paragraph.getMagic(Paragraph.java:736)
        at 
org.apache.zeppelin.socket.NotebookServer.addNewParagraphIfLastParagraphIsExecuted(NotebookServer.java:1780)
        at 
org.apache.zeppelin.socket.NotebookServer.persistAndExecuteSingleParagraph(NotebookServer.java:1807)
        at 
org.apache.zeppelin.socket.NotebookServer.runParagraph(NotebookServer.java:1773)
        at 
org.apache.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:265)
        at 
org.apache.zeppelin.socket.NotebookSocket.onWebSocketText(NotebookSocket.java:59)
        at 
org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextMessage(JettyListenerEventDriver.java:128)
        at 
org.eclipse.jetty.websocket.common.message.SimpleTextMessage.messageComplete(SimpleTextMessage.java:69)
        at 
org.eclipse.jetty.websocket.common.events.AbstractEventDriver.appendMessage(AbstractEventDriver.java:65)
        at 
org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextFrame(JettyListenerEventDriver.java:122)
        at 
org.eclipse.jetty.websocket.common.events.AbstractEventDriver.incomingFrame(AbstractEventDriver.java:161)
        at 
org.eclipse.jetty.websocket.common.WebSocketSession.incomingFrame(WebSocketSession.java:309)
        at 
org.eclipse.jetty.websocket.common.extensions.ExtensionStack.incomingFrame(ExtensionStack.java:214)
        at 
org.eclipse.jetty.websocket.common.Parser.notifyFrame(Parser.java:220)
        at org.eclipse.jetty.websocket.common.Parser.parse(Parser.java:258)
        at 
org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.readParse(AbstractWebSocketConnection.java:632)
        at 
org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onFillable(AbstractWebSocketConnection.java:480)
        at 
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
        at java.lang.Thread.run(Thread.java:748)
{code}

and at the same time livy interpreter can work correctly. even I choose default 
interpreter as markdown.
I checked my inner version zeppelin and find no modify about this error stack.
Any ideas for solving this Class Cast Exception?
Thanks.



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