FULL PRODUCT VERSION :
java version "1.6.0_14"
Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
I defined in my JNLP file, initial value for heap size and maximum value of heap size. This is my syntax:
<j2se initial-heap-size="512m" max-heap-size="512m" version="1.6+"/>
When I open my GUI, I checked the runtime heap size in the java web start console (press m), and I see that the maximum heap size exceeds 512 up to 1024.




STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Define <j2se initial-heap-size="512m" max-heap-size="512m" version="1.6+"/>
- Open GUI and see that it exceeds 512

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
GUI maximum heap should be 512m
ACTUAL -
GUI reaches giga

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
<j2se initial-heap-size="512m" max-heap-size="512m" version="1.6+"/>

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
I used '-Xms' and '-Xmx' instead:
<j2se java-vm-args="Xms512m -Xmx1024m" version="1.6+"/>