GWT 2.5.1: hashCode (int) > java.lang.Integer.MAX_VALUE

Hi,

I've done a fair amount of searching but not found anything related (so hopefully this is something stupid I'm doing).

I have a class for which I override hashCode() and equals(). The hashCode() method in Java always returns a value Integer.MIN_VALUE<=x<=Integer.MAX_VALUE. Great :)

In SuperDevMode and "production" mode (i.e. fully compiled and running in a J2EE container) the hashCode() method returns values less than MIN_VALUE and greater than MAX_VALUE.

The problem I encounter comes with the comparison of the hashCodes; e.g. hc1==hc2; where the HashCodes have been calculated similar to the following (I've stepped through my actual code in SDM):

HC1

result = 1;

result = 31 * result + (child1.hashCode()); // child1 hashCode is the same as child1 hashCode below

result = 31 * result + (child2.hashCode()); // child2's hashCode == 0

result = 2.3950366067525864e+39

HC2

result = 1;

result = 31 * result + (child1.hashCode()); // child1 hashCode is the same as child1 hashCode above

result = 31 * result + (child2.hashCode()); // child2's hashCode = 100

result = 2.3950366067525864e+39

GWT evaluates the two hashCodes as equal; whereas in reality they are minimally different (but identical at the precision shown).

Can anybody recommend the best practice to generate GWT (JavaScript)-friendly hash codes; or a workaround? (e.g. I notice GWT's AbstractList's hashCode performs "k = ~~ k" to presumably keep the value within limits?).

With kind regards,

Mike

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