[ZEPPELIN-2652] Can't open spark tutorial note in 0.8.0-SNAPSHOT

[tae-jun]

What is this PR for?

Fix the bug which cannot open a note containing a dynamic form.

It is not a problem of backward version compatibility.
I checked that it still cannot open the note created on v0.8.0.

With the line I added, now it works well.

What type of PR is it?

Bug Fix

What is the Jira issue?

https://issues.apache.org/jira/browse/ZEPPELIN-2652

How should this be tested?

• Create a note with dynamic form
• Reload notes
• Try to open the note

Questions:

• Does the licenses files need update? NO
• Is there breaking changes for older versions? NO
• Does this needs documentation? NO

[tae-jun]

@zjffdu Hi, could you please review this? I think this is related to #2245.

I am not sure that I did the right thing.
Is Input class an abstract class?

Thanks 😄

[zjffdu]

Thanks @tae-jun , I also fix it in #2272. The right fix should use the same gson as Note. Because GUI is part of Note.

[tinkoff-dwh]

LGTM. but try fix ci (restart failed jobs)

[soralee]

LGTM! Make sure that CI become green.

[tae-jun]

@tinkoff-dwh @soralee Thanks for the reviews 😄

[tae-jun]

@zjffdu Thanks for the review! I see.

Then would it better to close this PR and wait for it?
What do you think? :)

[zjffdu]

@tae-jun please close it, it will be fixed in #2272. Thanks

[tae-jun]

@zjffdu Ok. Thanks!