[antlr-interest] java.lang.StackOverflowError

[wirving at beats.hu]

Helo!

I want to create a Tree Grammar from my "normal" grammar (with the method
described in the ANTLR book), and after I corrected some obvious errors
(remove AST operators, etc.) I got this one:

Exception in thread "Thread-5" java.lang.StackOverflowError
	at java.util.AbstractList$Itr.<init>(Unknown Source)
	at java.util.AbstractList$ListItr.<init>(Unknown Source)
	at java.util.AbstractList.listIterator(Unknown Source)
	at java.util.AbstractList.listIterator(Unknown Source)
	at org.antlr.misc.IntervalSet.add(IntervalSet.java:104)
	at org.antlr.misc.IntervalSet.add(IntervalSet.java:93)
	at org.antlr.misc.IntervalSet.of(IntervalSet.java:74)
	at org.antlr.misc.IntervalSet.complement(IntervalSet.java:231)
	at org.antlr.misc.IntervalSet.subtract(IntervalSet.java:264)
	at org.antlr.analysis.DFAState.addReachableLabel(DFAState.java:343)
	at org.antlr.analysis.DFAState.addNFAConfiguration(DFAState.java:254)
	at org.antlr.analysis.NFAToDFAConverter.closure(NFAToDFAConverter.java:633)
	at org.antlr.analysis.NFAToDFAConverter.closure(NFAToDFAConverter.java:756)
	at org.antlr.analysis.NFAToDFAConverter.closure(NFAToDFAConverter.java:709)
....
and so on.


What could be wrong? How can I "debug" this kind of errors?

Thanks,
   Zoli