FULL PRODUCT VERSION :
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) Client VM (build 25.60-b23, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [version 10.0.10240]

A DESCRIPTION OF THE PROBLEM :
Java 7 launchers report too large -Xmx as an error while Java 8 does not. We are using the 32 bit versions.

Here are the different scenarios:

jdk1.7.0_04\bin>java -Xmx2000m
-> error message in console:
  Error occurred during initialization of VM
  Could not reserve enough space for object heap
  Error: Could not create the Java Virtual Machine.
  Error: A fatal exception has occurred. Program will exit.

jdk1.7.0_04\bin>javaw -Xmx2000m
-> error message in dialog:
  Error: Could not create the Java Virtual Machine.
  Error: A fatal exception has occurred. Program will exit.

jdk1.8.0_60\bin>java -Xmx2000m
-> error message in console:
  Error occurred during initialization of VM
  Could not reserve enough space for 2048000KB object heap

jdk1.8.0_60\bin>javaw -Xmx2000m
-> no error message!

This is very problematic because application shortcuts do contain -Xmx which may have to be adjusted with Java 8 (value that was working with Java 7 does not work with Java 8), but when the user clicks, nothing happens and they have no clue why. Before, there was an error dialog for such problems.


REGRESSION. Last worked in version 7u75

ADDITIONAL REGRESSION INFORMATION:
It is likely to work with any Java 7, but I only tested with 1.7.0_04

java version "1.7.0_04"
Java(TM) SE Runtime Environment (build 1.7.0_04-b20)
Java HotSpot(TM) Client VM (build 23.0-b21, mixed mode, sharing)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
jdk1.8.0_60\bin>javaw -Xmx2000m

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
We expected an error dialog showing a fatal error while launching the JVM.
ACTUAL -
Nothing is shown. Using "java" instead of "javaw" is missing some "Error: xxx" lines.

REPRODUCIBILITY :
This bug can be reproduced always.