[jira] [Created] (UIMA-4233) Ruta: NPE for Gather on optional rule element

["Peter Klügl (JIRA)" <de...@uima.apache.org>]

Peter Klügl created UIMA-4233:
---------------------------------

             Summary: Ruta: NPE for Gather on optional rule element
                 Key: UIMA-4233
                 URL: https://issues.apache.org/jira/browse/UIMA-4233
             Project: UIMA
          Issue Type: Bug
          Components: ruta
    Affects Versions: 2.2.1ruta
            Reporter: Peter Klügl
            Assignee: Peter Klügl
             Fix For: 2.3.0ruta


A user reported on the mailing list:

The following RUTA grammar:

{noformat}
DECLARE Annotation A;
DECLARE Annotation B;
DECLARE Annotation C(Annotation a, Annotation b);

W{REGEXP("A")->MARK(A)};
W{REGEXP("B")->MARK(B)};

A B?{-> GATHER(C, 1, 2, "a" = 1, "b" = 2)};
{noformat}

Run s as expected on the input "A B C", but gets a NullPointerException on
"A X C", presumably because the 2 index is not mapped to anything.



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