How to narrowing the OutOfMemoryError?

[sapsa]

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ERROR 2013-11-30 17:19:56.498 [New I/O worker #3] Error adding child: "Case Cover Back Outer.jpg"
java.lang.OutOfMemoryError: Java heap space
INFO  2013-11-30 17:21:52.535 [UPNPHelper] Exception in thread "UPNPHelper" java.lang.OutOfMemoryError: Java heap space

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "UPNPHelper"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "UPNP-AliveMessageSender"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "pool-2-thread-3"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "pool-2-thread-4"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "pool-2-thread-2"

Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "Timer-0"

The error message is after 2 days of running headless. I had to restart it because it forked to many process and encoding started to lag.
Spec: E6750 @ 2.66GHz
RAM : 3GB