[ZEPPELIN-5467] Fix NullPointerException of org.apache.zeppelin.socket.NotebookServer when invalid ticket message received

• Type: Improvement
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 0.9.0, 0.9.1
• Fix Version/s: 0.9.0, 0.9.1
• Component/s: zeppelin-server
• Flags: Patch
• Assignee: Unassigned
• Reporter: vmaster.cc
• Created: 24/Jul/21 04:40
• Updated: 13/Sep/21 06:37
• Resolved: 13/Sep/21 06:37

Description

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.