I'm installing TestRail on my JIRA server, and it has a few prerequisite requirements on what should be already present on the server: http://docs.gurock.com/testrail-admin/installation-requirements
The tomcat is distributed with what we need to run JIRA and not much more (unless we just didn't notice it). It does not have PHP, which is not a technology that we use in JIRA's user interface.
You best bet is probably to either install your own PHP-enabled apache in front of JIRA or to search around for ways to integrate with PHP directly from tomcat, like this SO post.
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