why does my compare method throw exception — Comparison method violates its general contract!

Question

Why does this code

public class SponsoredComparator implements Comparator {

    public boolean equals(SRE arg0, SRE arg1){
        return arg0.g         


        

Answer 1

I got the same problem today in a web application. Four calls working on the same array tried to sort it at the same time, effectively messing up for each other.