From Forum Nokia Wiki

ID	KIJ000537	Creation date	December 29, 2006
Platform	Series 80 2nd Edition	Devices	Nokia 9300i, Nokia 9300
Category		Subcategory

Keywords (APIs, classes, methods, functions):

Description

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.
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.
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.