Github user khalidhuseynov commented on the pull request: https://github.com/apache/zeppelin/commit/13178aee18c0a4aed1dda0c72750e08c9ed9f53c#commitcomment-20062571 In zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/repo/NotebookRepo.java: In zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/repo/NotebookRepo.java on line 138: actually that was for a bit edge case if some instance was cast into `Object` and then into `Revision`, but generally that may not be needed. addressed all in 0408c9a3159f7e130e524f74d8fbbbca4acffc41
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