BTW:
Since there is a check against City object being null before the compare
method:
// TODO: look at what this is doing...
if(city != null && other.city != null)
return city.getName().compareTo(other.city.getName()); <--- Here
happens the NPE
if (hashCode() == other.hashCode())
return 0;
I suspect the getName()-function from City object to return <null> in some
cases.
I'm @ work right now and can't explore, but i remember City.getName()
checking for Label != <null> but then calling Label.getText(), which does
*not* check for <null>.
Best regards, Uli
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