FULL PRODUCT VERSION :
1.6.0_18 (x64)

FULL OS VERSION :
Windwos 7 (6.1) x64

EXTRA RELEVANT SYSTEM CONFIGURATION :
Eclipse 3.5 x64 / Eclipse 3.6 x64

A DESCRIPTION OF THE PROBLEM :
Compiling a small test class with eclipse (eclipse 3.5 x64 or eclipse 3.6M5 x64) the generated class file will not run as expected on the jvm 1.6.0.18 x64 - but runs without error on 1.6.0_18 x32.

When the class is compiled directly with the jdk 1.6.0_18 x64 both runs are fine. Posted this in eclipse forum and they mentioned that this is possible a JIT error because the when you run it with

java  -Djava.compiler=none X

everything is fine with the eclipse generated class file

Have a look to both forum entrys (sun/elipse) for more details:
http://forums.sun.com/thread.jspa?threadID=5427954&tstart=0
https://bugs.eclipse.org/bugs/show_bug.cgi?id=303096

THE PROBLEM WAS REPRODUCIBLE WITH -Xint FLAG: Did not try

THE PROBLEM WAS REPRODUCIBLE WITH -server FLAG: Did not try

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile thes test case class with eclipse (win7x64  3.5 x64/ 3.6 x64 - maybee also with the x32 win eclipse?!)

just run it with java (1.6.0_18 x64) and the two boolean will have a different state after the loops for Integer.MAX_VALUE but the same for Interger.MAX_VALUE - 1?

run it with java (1.6.0_18 x32 Version) and both loops will result in the same error.


EXPECTED VERSUS ACTUAL BEHAVIOR :
Actual 1.6.0_18 result (x64)

ERROR: Boolean invert
    test1=true
    test2=false
Everything as it should be!

Expected

Everything as it should be!
Everything as it should be!


ERROR MESSAGES/STACK TRACES THAT OCCUR :
No Error MEssage

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class problem64Bit
{

    /**
     * @param args
     *            Arguments
     */
    public static void main(final String[] args)
    {
        booleanInvert(Integer.MAX_VALUE);
        booleanInvert(Integer.MAX_VALUE - 1);
    }

    private static void booleanInvert(final int max)
    {
        boolean test1 = false;
        boolean test2 = false;

        for (int i = 0; i < max; i++)
        {
            test1 = !test1;
        }

        for (int i = 0; i < max; i++)
        {
            test2 ^= true;
        }

        if (test1 != test2)
        {
            System.out.println("ERROR: Boolean invert\n\ttest1=" + test1
                    + "\n\ttest2=" + test2);
        } else
        {
            System.out.println("Everything as it should be!");
        }
    }
}
---------- END SOURCE ----------