Java Engine not starting

Dears,

I have ECC5 server installed on SQL server and OS is Windows 2003 server.From a long time I am facing issue that When I start my SAP system by MMC my java engine does not get started.It remains in state:

Application stopped.

Details: You have requested an application that is currently stopped

So every time I have to start Java Engine Manually by SMICM.

Please suggest what could be reason of it.

Also want to know function of SAPJSF user in Java Stack.

Shivam