Hi @Stefterv

I tried running the project on JDK21. As you mentioned, it crashes when running ant-preproc.

The puzzling thing is that the ant java antlr task which it claims to be crashing on completes successfully on either JDK when run from the command line.

Even if you remove the generation part and just leave

<target name="preproc" description="Compile ANTLR 4 grammar">
      <java classname="org.antlr.v4.Tool"
          failonerror="true">
        <classpath path="${antlr_jar}" />
      </java>
    </target>

gradle still crashes on JDK21. Feels like it's more of a gradle - ant interfacing issue rather than genuine antlr failure.

So it should be possible to at least move this part to the gradle script. Something along the lines of (I am not proficient with gradle but this seems to work on JDK21):

tasks.register<JavaExec>("ant-preproc") {
    group = "build"
    description = "Compile ANTLR 4 grammar"
    classpath = files("${projectDir}/../mode/antlr-4.7.2-complete.jar")
    mainClass.set("org.antlr.v4.Tool")
    args(
        "-o", "${projectDir}/../generated/processing/mode/java/preproc",
        "-package", "processing.mode.java.preproc",
        "${projectDir}/../src/processing/mode/java/preproc/Processing.g4"
    )
    isIgnoreExitValue = false
}

With this change and setting IntelliJ to a JDK21 SDK version I am able to get processing to run.

Please let me know if you'd like me to explore this further.

Thanks,
Vlad

Uh oh!

Pull Processing into Java 21 #879

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