Documentation for JIRA 4.0. Documentation for other versions of JIRA is available too. 
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This page has general notes on installing JIRA on JBoss 4.
Attached are console logs from installing JIRA on JBoss on a Linux (Ubuntu) server:
JBoss does odd things with classloaders, and as a result its own log4j configuration file is found before JIRA's own. This means (on 4.0.x) that you will get lots of DEBUG-level logs in stdout.