To java 8

[parrt]

@KvanTTT @ericvergnaud trying to see if 1.8 works.

[KvanTTT]

Unfortunately, there are problems with tests due to compilation failure.

[parrt]

yep, this is the error in maven i can't solve

Error:  Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project antlr4-runtime: Compilation failure -> [Help 1]

Please note javac and intellij compile code fine with java 8

[parrt]

I am abandoning this because I cannot get 1.8 or above to work due to incompatibility with the use of internal javac lib objects. I was able to compile with 1.8 and 11 but not 17 prior to this attempt, when the source and target were left as 1.7 in the maven pom.