There are a few options when turning on tracing and logging. You can get severe errors and system errors as well as package specific tracing (if enabled). Logging/tracing usually found in /WebSphere/AppServer/profiles//logs/. See Logging and tracing at the Information Center.
- Look in system error logs, found in /WebSphere/AppServer/profiles//logs/server1/SystemErr.log
- Look in system out logs, found in /WebSphere/AppServer/profiles//logs/server1/SystemOut.log
Look in ffdc logs, found in /WebSphere/AppServer/profiles//logs/ffdc
Turn on tracing on Websphere server
Using the Information Center: Setting a diagnostic trace on a server - shows how to set up a trace for a particular package of interest.
If you are having issues with chats persisting, enable tracing in WebSphere ISC for package com.ibm.sametime.persistence.