Deron Eriksson created SYSTEMML-949:

             Summary: Delete ANTLR tokens files during initialize phase
                 Key: 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

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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