How to package it into a maven project?

[Pkkkkkkkk]

Hi,I'd like to package it in a maven project,because there is nothing result(null) when I use those java Class which are translated from .g4 file to parse a sql clause about "insert into".But when I use the antlrv4 plugin(loading .g4 file) to parse sql,it will run&show perfectly ,no just in this case. So I wonder if it could be packaged in java project and just use it dirctly.
Have a nice day ^^