Deron Eriksson created SYSTEMML-949:
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             Summary: Delete ANTLR tokens files during initialize phase
                 Key: SYSTEMML-949
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-949
             Project: SystemML
          Issue Type: Task
          Components: Build
            Reporter: Deron Eriksson
            Assignee: Deron Eriksson


With the move to antlr 4.5.3, the antlr4-maven-plugin gives a "No grammars to 
process" message during "mvn clean package" if *.tokens files have previously 
been generated. Using previously generated tokens files can lead to unexpected 
behavior (see comments from 
https://github.com/apache/incubator-systemml/pull/243).

The tokens files can be deleted during the "initialize" maven lifecycle phase 
so that they will be regenerated during the "generate-sources" maven lifecycle 
phase (that the antlr4 goal binds to).




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