please refer a below link:
https://confluence.atlassian.com/jirakb/unable-to-create-new-issues-after-upgrading-to-jira-7-815588418.html?utm_medium=logScan&utm_source=STP
Hi !
According to the article, It seems to be a problem with server.xml file.
Did you check all is correct with the file after upgrade? This file is supposed to be modified only for configure reverse-proxy or ssl for https, by default it comes configured for http.
Have you tried disabling reverse proxy using the resolution of this article?
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