Ruslan Dautkhanov created ZEPPELIN-2506:
-------------------------------------------

             Summary: "Interpreter null not found" when a note is not bound to 
any interpreters
                 Key: ZEPPELIN-2506
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-2506
             Project: Zeppelin
          Issue Type: Bug
    Affects Versions: 0.7.1, 0.7.2, 0.8.0
            Reporter: Ruslan Dautkhanov


When we setup a new user or upgrade a note, interpreter.json file is copied 
from a template file. So "interpreterBindings" is empty or irrelevant to notes 
that an upgraded user has. It causes following exception:

{noformat}
org.apache.zeppelin.interpreter.InterpreterException: 
paragraph_1491878547585_-790720711's Interpreter null not found
        at org.apache.zeppelin.notebook.Note.run(Note.java:625)
        at 
org.apache.zeppelin.socket.NotebookServer.persistAndExecuteSingleParagraph(NotebookServer.java:1781)
        at 
org.apache.zeppelin.socket.NotebookServer.runParagraph(NotebookServer.java:1741)
        at 
org.apache.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:288)
{noformat}

It would be better to show error message *that the note is not bound to any 
notes, and not let execute any paragraphs until this is fixed*.

If a paragraph has an explicit interpreter type defined, then this error is 
slightly different but this does not change the matter 

{noformat}
paragraph_1491878547585_-790720711's Interpreter pyspark not found
org.apache.zeppelin.interpreter.InterpreterException: 
paragraph_1491878547585_-790720711's Interpreter pyspark not found
        at org.apache.zeppelin.notebook.Note.run(Note.java:625)
        at 
org.apache.zeppelin.socket.NotebookServer.persistAndExecuteSingleParagraph(NotebookServer.java:1781)
        at 
org.apache.zeppelin.socket.NotebookServer.runParagraph(NotebookServer.java:1741)
        at 
org.apache.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:288)
        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:745)
{noformat}



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