dyanarose commented on issue #4748: null pointer exception when IDEA 2017.2 generate ANTLR code URL: https://github.com/apache/incubator-druid/issues/4748#issuecomment-426977330 though closed because the reporter changed to eclipse, I thought I'd post a cause and solution to this issue when using IntelliJ. The problem is noted on this line of the error logging: `error(31): ANTLR cannot generate java code as of version 4.7` the ANTLR v4 grammar plugin, version 1.8.4, runs ANTLR version 4.7. Druid's ANTLR looks to be 4.5.1 in order to compile ANTLR 4.5.1, you need to download ANTLR v4 grammar plugin version 1.7 and install it from disk.
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