Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/2272
@felixcheung toJson and fromJson is used in both zeppelin-interpreter and
zeppelin-zengine. I didn't find a proper place to put the common interface. And
actually the interface doesn't not eliminate the code, the sub classes still
need to implement `toJson` as not every classes share the same Gson (some class
need custom Gson). So I didn't add a common interface. Please help review it.
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