Archived:Java VM does not reuse memory in S80 2nd Edition early firmware (Known Issue)
In Nokia 9300 models with firmware older than 6.27 Java VM never shrinked heap and thus it did not release free memory to the native side. This caused the heap size to increase gradually.
In general, memory released from the MIDlet should be available for the MIDlet again. Also free memory should be released from Java VM to Symbian OS as well.
To correct this problem the VM implementation in firmware 6.27 was changed so that in Runtime.gc() releases free memory to the native side, if possible.