You can use Cross Component Trace (XCT) to help diagnose problems in WebSphere® Application Server.
Administrators using WebSphere Application Server need to use log and trace files to determine whether their applications and the server are running correctly.
Depending on the nature of your applications, multiple threads within an application server may be used to handle requests, such as HTTP requests or JMS requests. Some requests may be handled by more than one application server, such as when one application server makes a request to another application server for a web services request.
You can use XCT to augment your log and trace files with correlation information. This correlation information clarifies which threads and which application server processes participated in the handling of each request.