SD+ Service exiting with Java heap space

In the last few days the following error has began to crop up causing the SD+ service to exit. Sometime a restart fixes it for while.. other times.. it exits immediatly. (running 7504)

This was found in the serverout0.txt file

[17:38:02:137]|[02-24-2009]|[com.adventnet.servicedesk.setup.action.ErrorLogDetailsAction]|[INFO]|[22]|: Form details before returning : ErrorLog Id : 77701, Error Message : null, Module : null, Occurred At : null, Probable Cause : null, Performed By : null|
[17:38:05:600]|[02-24-2009]|[SYSOUT]|[INFO]|[17]|: Low Memory detected: Thread: Thread[Thread-13,5,jboss] Exception:: java.lang.OutOfMemoryError: Java heap space|
[17:38:05:616]|[02-24-2009]|[SYSOUT]|[INFO]|[17]|: Thread Thread[Thread-13,5,jboss] exited unexpectedly.java.lang.OutOfMemoryError: Java heap space|
[17:38:06:349]|[02-24-2009]|[SYSOUT]|[INFO]|[32]|: Shutdown Hook called.|
[17:38:06:349]|[02-24-2009]|[SYSOUT]|[INFO]|[32]|: Found server|

Remember this is recent.. there is loads of memory on this system. 1 GB ram and 1.5GB paging space.

Any ideas?