FULL PRODUCT VERSION :
java version "1.6.0-rc"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-rc-b61)
Java HotSpot(TM) Client VM (build 1.6.0-rc-b61, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Debian GNU/Linux x86-32

A DESCRIPTION OF THE PROBLEM :
public class t {
    public static void main(String[] args) {
        int[] newArray=new int[1073741824];
        newArray[1073741823]=12345;
        System.out.println("Size of newArray is "+newArray.length+
                           " [it should be 1073741824]");
        System.out.println(newArray[1073741823]);
    }
}

With Mustang b59 and b61 (the only two tested) this is the output:
$ /usr/lib/j2sdk6.0-sun/bin/javac t.java && /usr/lib/j2sdk6.0-sun/bin/java t
Size of newArray is 12345 [it should be 1073741824]
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1073741823
        at t.main(t.java:7)

Java 5.0:
$ /usr/lib/j2sdk1.5-sun/bin/javac t.java && /usr/lib/j2sdk1.5-sun/bin/java t
Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
If there is not enough memory/address space to create an array a java.lang.OutOfMemoryError should be thrown.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class t {
    public static void main(String[] args) {
        int[] newArray=new int[1073741824];
        newArray[1073741823]=12345;
        System.out.println("Size of newArray is "+newArray.length+
                           " [it should be 1073741824]");
        System.out.println(newArray[1073741823]);
    }
}
---------- END SOURCE ----------

Release Regression From : 5.0u4
The above release value was the last known release where this
bug was known to work. Since then there has been a regression.