Description Stefan2110 2010-02-17 13:08:23 EST

Build Identifier: I20100129-1300 (win64)

When I compile a small test class with eclipse and then run it with JVM 1.6.0_18 64Bit there will be an incorrect result. Running it with JVM 1.6.0_18 32Bit to get the proper result.

But When the class is compiled directly with the jdk 1.6.0_18 x64 you get the same (right) result on x64/x32 JVM.

Hava a look at
http://forums.sun.com/thread.jspa?threadID=5427954 
there i explained it too!

Here is the class
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!");
		}
	}
}

Both loops should result in the same boolean state - but when the loop iterates over INTEGER.MAX_VALUE then the compiled class (compiled with eclipse 3.6 x64 or 3.5 x64) will result in a different state.

Here is the output from the JVM 1.6.0_18 x64
ERROR: Boolean invert
	test1=true
	test2=false
Everything as it should be!

Reproducible: Always