[antlr-interest] NullPointerException in org.antlr.runtime.BaseRecognizer.memoize

[Aaron Armstrong]

I took the supplied java grammar and tried to make a parse tree out of a
very small program.  I used ANTLRWorks with the –debug flag to generate the
parser and lexer code.  When I ran my test code, I got a
NullPointerException:

Exception in thread "main" java.lang.NullPointerException
            at org.antlr.runtime.BaseRecognizer.memoize(BaseRecognizer.java
:741)
            at JavaParser.compilationUnit(JavaParser.java:367)
            cont'd…

Has this been encountered before by anyone?  Thanks in advance.
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