Maximum Heap Size in Java 5

When migrating an application from JDK1.4.2_12 to JDK1.5.0_10,it was seen that the max. heap size that was set using -Xmx had to be reduced from 1.5 GB to 1.3 GB on a win32 machine inorder to create JVM successfully. Any pointers to what in Java 5.0 could have brought about this change is highly appreciated.

(Please note that I understand how heap size allocation works w.r.t virtual memory on win32.)

[416 byte] By [cpnma] at [2007-11-26 15:00:37]