After upgrade JIRA shows 500 error page with message User has no unique key mapping
500 error page after JIRA upgrade
After upgrading error, JIRA shows the 500 error page with the following log message:
java.lang.IllegalStateException: User 'admin' has no unique key mapping.
The name of the user will be usually the administrator user and might differ based on your user configuration.
The current license is too old to install this version of JIRA (6.x.x).
For all upgrade methods, one of the pre-steps is to check that the current JIRA license is valid. If the license had expired before the upgrade, then it will lead to this error message. This is tracked as a known bug - JRA-37644Getting issue details... STATUS .