[GitHub] [zeppelin] aib628 opened a new pull request #4186: [bugfix]Fast return when invalid ticket of no session case

[GitBox]

aib628 opened a new pull request #4186:
URL: https://github.com/apache/zeppelin/pull/4186


   ### What is this PR for?
   Fix NullPointerException of org.apache.zeppelin.socket.NotebookServer when 
invalid ticket message received 
   This exception may occur when server sessions is not contains received 
principal. In other words, it happend when no session case.
   
   ### What type of PR is it?
   Bug Fix
   
   ### Todos
   haven't
   
   ### What is the Jira issue?
   [ZEPPELIN-5468] Fix NullPointerException of 
org.apache.zeppelin.socket.NotebookServer when invalid ticket message received
   
   ### How should this be tested?
   Login visit page and then logout in other page, see log output
   
   ### Screenshots (if appropriate)
   
![image](https://user-images.githubusercontent.com/18046946/126857669-2997491c-5fba-489f-8beb-2c5fc0fd367a.png)
   
   ### Questions:
   * Does the licenses files need update?  no
   * Is there breaking changes for older versions? no
   * Does this needs documentation? no
   


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