The WebSphere® Application Server has a hang detection policy for monitoring threads that have been active longer than the time defined by the thread monitor threshold.
WSVR0605W: Thread threadname has been active for hangtime and may be hung. There are totalthreads threads in total in the server that may be hung.Disabling the hang detection policy disables the monitoring of all thread pools residing in WebSphere Application Server and is not recommended. However, you can configure the hang detection policy using the procedure Detecting hung threads in J2EE applications in the WebSphere Application Server Information Center.