Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/2268
Sorry for the late review.
seems that it doesn't work with existing settings. Even can't start
Zeppelin instance.
```
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to
com.google.gson.internal.StringMap
at
org.apache.zeppelin.interpreter.InterpreterSettingManager.loadFromFile(InterpreterSettingManager.java:174)
at
org.apache.zeppelin.interpreter.InterpreterSettingManager.init(InterpreterSettingManager.java:345)
at
org.apache.zeppelin.interpreter.InterpreterSettingManager.<init>(InterpreterSettingManager.java:150)
at
org.apache.zeppelin.server.ZeppelinServer.<init>(ZeppelinServer.java:149)
... 29 more
```
- It would be nicer to provide migration function like
https://github.com/apache/zeppelin/blob/master/zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/Notebook.java#L418
- or use the default type / widget if a field doens't have (e.g `string`,
`input`)
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