Incompatible with Gradle Configuration Cache

[Fleshgrinder]

The plugin is incompatible with the Gradle configuration cache feature.

I'm mostly creating this as a tracking issue and might come back later and raise a PR to fix it. I'm currently not blocked by this, but having support for all current Gradle features would obviously be desirable.

[koppor]

The error message is

Caused by: java.lang.NullPointerException: Cannot invoke "org.gradle.api.Project.getExtensions()" because "this.project" is null
        at org.javamodularity.moduleplugin.JavaProjectHelper.extension(JavaProjectHelper.java:36)
        at org.javamodularity.moduleplugin.JavaProjectHelper.modularityExtension(JavaProjectHelper.java:44)
        at org.javamodularity.moduleplugin.tasks.CompileJavaTaskMutator.buildCompilerArgs(CompileJavaTaskMutator.java:60)
        at org.javamodularity.moduleplugin.tasks.CompileJavaTaskMutator.modularizeJavaCompileTask(CompileJavaTaskMutator.java:44)
        at org.javamodularity.moduleplugin.tasks.CompileTask$2.execute(CompileTask.java:103)
        at org.javamodularity.moduleplugin.tasks.CompileTask$2.execute(CompileTask.java:100)

The workaround is to have following line in gradle.properties

org.gradle.configuration-cache=false

[koppor]

I was given following hints:

1. Gradle has native support for the module system: https://docs.gradle.org/current/userguide/java_library_plugin.html#sec:java_library_modular
2. General information page on gradle and modules: https://github.com/jjohannes/java-module-system
3. The "modern" way to add extra module information: https://github.com/gradlex-org/extra-java-module-info#defining-extra-module-information