Please update the documentation http://www.atlassian.com/software/jira/docs/v2.6.1/servers/weblogic.html

Please insert the hint:
Due to performance improvements ensure running BEA WebLogic Server in production mode.

See:
http://e-docs.bea.com/wls/docs81/ConsoleHelp/domain_domain_config_general.html
http://e-docs.bea.com/platform/docs81/confgwiz/newdom.html#devprod
http://e-docs.bea.com/wls/docs70/webapp/weblogic_xml.html

Furthermore change the following file: weblogic.xml
into jsp-descriptor element:
—
<jsp-param>
<param-name>pageCheckSeconds</param-name>
<param-value>-1</param-value>
</jsp-param>
—
into weblogic-web-app element:
—
<container-descriptor>
<servlet-reload-check-secs>-1</servlet-reload-check-secs>
</container-descriptor>
—