You can log WAS system messages from a variety of sources, including appserver components and applications. Messages logged by application server components and associated IBM products start with a unique message identifier that indicates the component or application that issued the message. The message identifier can be either 8 or 9 characters in length and has the formCCCC1234X
CCCC Four character alphabetic component or application identifier. 1234 Four character numeric identifier used to identify the specific message for that component. X Optional alphabetic severity indicator.
I Informational W Warning E Error