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Posted to issues@metron.apache.org by "Otto Fowler (JIRA)" <ji...@apache.org> on 2017/08/06 02:42:00 UTC

[jira] [Created] (METRON-1089) STELLAR Shell: Handle NoViableAltException with better information

Otto Fowler created METRON-1089:
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             Summary: STELLAR Shell: Handle NoViableAltException with better information
                 Key: METRON-1089
                 URL: https://issues.apache.org/jira/browse/METRON-1089
             Project: Metron
          Issue Type: Improvement
            Reporter: Otto Fowler
            Assignee: Otto Fowler


Antlr's NoViableAltException is thrown when Antlr cannot figure out what to do when building the expression tree.  This happens when the grammar is improperly posed.

For example:
> TO_UPPER(IN)

Where IN is a reserved phrase, but is not posed correctly.

This is basically an invalid syntax exception.  But buried in the cause of a ParseException, it really is not helpful.

The shell should find the ParseException cause, and if it is this exception, output a better message




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