Github user Leemoonsoo commented on a diff in the pull request:
https://github.com/apache/incubator-zeppelin/pull/22#discussion_r27655027
--- Diff:
zeppelin-zengine/src/main/java/com/nflabs/zeppelin/notebook/Note.java ---
@@ -231,6 +232,9 @@ public void run(String paragraphId) {
p.setNoteReplLoader(replLoader);
p.setListener(jobListenerFactory.getParagraphJobListener(this));
Interpreter intp = replLoader.get(p.getRequiredReplName());
+ if (intp == null) {
--- End diff --
When user try to use non-exists interpreter, for example run `%nonexist
statment`, it raise null pointer exception at previous line and this
conditional block won't be executed.
In this case, there's an exception in log file
```
ERROR [2015-04-02 22:01:36,584] ({WebSocketWorker-8}
NotebookServer.java[runParagraph]:431) - Exception from run
java.lang.NullPointerException
at
com.nflabs.zeppelin.notebook.NoteInterpreterLoader.get(NoteInterpreterLoader.java:70)
at com.nflabs.zeppelin.notebook.Note.run(Note.java:234)
at
com.nflabs.zeppelin.socket.NotebookServer.runParagraph(NotebookServer.java:428)
at
com.nflabs.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:96)
at
org.java_websocket.server.WebSocketServer.onWebsocketMessage(WebSocketServer.java:469)
at org.java_websocket.WebSocketImpl.decodeFrames(WebSocketImpl.java:368)
at org.java_websocket.WebSocketImpl.decode(WebSocketImpl.java:157)
at
org.java_websocket.server.WebSocketServer$WebSocketWorker.run(WebSocketServer.java:657)
```
but gui does not display it.
Could you handle this case, too?
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