I am taking this error while starting up.
I tried to increasing memory size, time for enabling plugins etc. but none of them solved the issue.
I also check out this page but not find any solution:
https://confluence.atlassian.com/jirakb/troubleshooting-jira-startup-failed-error-394464512.html
I found the solution, you can check here:
https://community.atlassian.com/t5/Questions/Jira-7-1-0-server-startup-error/qaq-p/105310#M11178
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