Installing Confluence and JIRA Together
For information on Atlassian's recommendation on JIRA and Confluence installation, see Integrating JIRA and Confluence.
Do not deploy multiple Atlassian applications in a single Tomcat container — Deploying multiple Atlassian applications in a single Tomcat container is not supported. We do not test this configuration and upgrading any of the applications (even for point releases) is likely to break it. There are also a number of known issues with this configuration (see this FAQ for more information).
There are also a number of practical reasons why we do not support deploying multiple Atlassian applications in a single Tomcat container. Firstly, you must shut down Tomcat to upgrade any application and secondly, if one application crashes, the other applications running in that Tomcat container will be inaccessible.
Finally, we recommend not deploying any other applications in the same Tomcat container that runs JIRA, especially if these other applications have large memory requirements or require additional libraries in Tomcat's
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