Debugging WebLogic Server (WLS) JMS Messaging Bridge [ID 1303870.1]

You can enable the debug flags listed below from the Administration Console by clicking on Managed server to which JMS Messaging Bridge is targeted going to Debug tab and expanding -> weblogic -> messagingbridge

DebugMessaging 
DebugMessagingBridgeDumpToConsole 
DebugMessagingBridgeDumpToLog 
DebugMessagingBridgeRuntime 
DebugMessagingBridgeStartup

Above debug flags can also be enabled in the startup script by using Dweblogic debug flags listed below:

-Dweblogic.Debug.DebugMessagingBridgeStartup=true 
-Dweblogic.Debug.DebugMessagingBridgeRuntime=true 
-Dweblogic.Debug.DebugMessagingBridgeRuntimeVerbose=true 
-Dweblogic.Debug.DebugMessagingBridgeDumpToLog=true 
-Dweblogic.Debug.DebugMessagingBridgeDumpToConsole=true

Note: Above debug flags can be enabled dynamically and do not need server restart. Enabling this debug flags will be very verbose.

Link:

https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&doctype=FAQ&id=1303870.1