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google-java-format (and removeUnusedImports) broken on JDK 16+ (has workaround)

When running under JDK 16 I get this error message:

Task :spotlessJava FAILED
Step 'google-java-format' found problem in 'src/main/java/se/inoviagroup/v2t/gateway/api/AuthUtils.java':
        ...
Caused by: java.lang.IllegalAccessError: class com.google.googlejavaformat.java.JavaInput (in unnamed module @0x615edab4) cannot access class com.sun.tools.javac.parser.Tokens$TokenKind (in module jdk.compiler) because module jdk.compiler does not export com.sun.tools.javac.parser to unnamed module @0x615edab4
        at com.google.googlejavaformat.java.JavaInput.buildToks(JavaInput.java:349)
        at com.google.googlejavaformat.java.JavaInput.buildToks(JavaInput.java:334)
        at com.google.googlejavaformat.java.JavaInput.<init>(JavaInput.java:276)
        at com.google.googlejavaformat.java.Formatter.getFormatReplacements(Formatter.java:280)
        at com.google.googlejavaformat.java.Formatter.formatSource(Formatter.java:267)
        at com.google.googlejavaformat.java.Formatter.formatSource(Formatter.java:233)
        ... 142 more

EDIT:

EDIT 2 & 3

  • we thought no workaround necessary starting with plugin-gradle 6.5.1 and plugin-maven 2.22.3, but that was incorrect, the workaround is still required