Building ANTLR4 from source seems to not be working for me

[Chris Miner]

Hi,

Out of curiosity, I am trying to build ANTLR from source following the instructions at 

https://github.com/antlr/antlr4/blob/master/doc/building-antlr.md

After 

mvn -DskipTests install

The build errors with:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:testCompile (default-testCompile) on project antlr4-runtime-testsuite: Fatal error compiling: java.lang.IllegalAccessError: class org.antlr.v4.test.runtime.CommentHasStringValueProcessor (in unnamed module @0x6e649fd0) cannot access class com.sun.tools.javac.model.JavacElements (in module jdk.compiler) because module jdk.compiler does not export com.sun.tools.javac.model to unnamed module @0x6e649fd0 -> [Help 1]

Probably there is a simple fix. Ideas?

[Terence Parr]

That looks to be an older version of antlr; CommentHasStringValueProcessor should be gone in 4.10 :)
Ter

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[Chris Miner]

hmmm....

I'm using the master, which based on the docs is the one that has the latest greatest most stable version which I presume is 4.10.1.  I was going to say there isn't a tag for 4.10.1 as near as I can tell, but I see there is on GitHub, but not according to vs code.  Not sure why that doesn't show up in vs code.  Still, I am trying this build on the master 'main' branch.

[Chris Miner]

weird.... I did a fresh clone and it worked beautifully.  Alright!  problem solved.  (except for the little detail of why it didn't work in the first place.  learning opportunity!)