JDK>17: unit test fail to compile: Task :compileTestGroovy FAILED

[jpstotz]

When using a JDK newer than Java 17 the gradle task compileTestGroovy will fail:

* What went wrong:
Execution failed for task ':compileTestGroovy'.
> BUG! exception in phase 'semantic analysis' in source unit 'sshj\src\test\groovy\com\hierynomus\sshj\common\KeyTypeSpec.groovy' Unsupported class file major version 65

As workaround you can change the java entry in build.gradle to use a JDK 17 toolchain:

java {
  toolchain {
    languageVersion = JavaLanguageVersion.of(17) 
  }
  withJavadocJar()
  withSourcesJar()
}

[alexandrejbr]

Does this commit fixes your issue? 2cc1c1b

[jpstotz]

@alexandrejbr Using 15d6924 (latest master) + that fix ./gradlew compileTestGroovy runs without problems using Java 21, thanks.

[alexandrejbr]

I have opened a PR with that fix. Let's see if @hierynomus and the rest of the community thinks it is a good idea.