There is a netbeans.org bug reported at 
http://openide.netbeans.org/issues/show_bug.cgi?id=46993
which basically means that a field that get's assigned in just two places (in constructor and in a method that is never called) suddenly becomes equal to this. 

The constructor looks like:

FilterNode (Node original) {
  this.original = original;
}

and according to java language spec the original can never == this, still in certain situations this happens and is manifested by a StackOverFlow in hashCode 

int hashCode () {
  return original.hashCode();
}

as can be seen in various attachments in the issue. The attachement with most logging is likely this one:

------- Additional Comments From lynggaard 2004-09-23 14:04 PDT -------

Created an attachment (id=17853)
log of patched 21/9 build, another error. zipped

Which should stacktraces of all modifications to the FilterNode.original field and which shows that nobody modifies the field outside of constructor and yet it ends up == this.

I am looking for a help, as I my imagination cannot think of a situation when our code would be broken.
###@###.### 10/4/04 16:52 GMT