3.4.1 Seems to require Java 15, becomes incompatible with lower Java versions

I don’t see what in the diff caused the incompatibility https://github.com/jeremymailen/kotlinter-gradle/compare/3.4.0...3.4.1, but when trying to use recent plugin version in an environment with lower java version, it fails with a message similar to:

> Could not resolve all artifacts for configuration ':buildSrc:classpath'.
   > Could not resolve org.jmailen.gradle:kotlinter-gradle:3.4.1.
     Required by:
         project :buildSrc > org.jmailen.kotlinter:org.jmailen.kotlinter.gradle.plugin:3.4.1
      > No matching variant of org.jmailen.gradle:kotlinter-gradle:3.4.1 was found. The consumer was configured to find a runtime of a library compatible with Java 11, packaged as a jar, and its dependencies declared externally, as well as attribute 'org.gradle.plugin.api-version' with value '7.0' but:
          - Variant 'apiElements' capability org.jmailen.gradle:kotlinter-gradle:3.4.1 declares a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares an API of a component compatible with Java 15 and the consumer needed a runtime of a component compatible with Java 11
              - Other compatible attribute:
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.0')
          - Variant 'runtimeElements' capability org.jmailen.gradle:kotlinter-gradle:3.4.1 declares a runtime of a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares a component compatible with Java 15 and the consumer needed a component compatible with Java 11
              - Other compatible attribute:
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.0')

The build passes on Java 15. Sample failed run

I’m quite sure that’s not an expected behavior change so I’m reporting an issue here.

btw. the new Gradle Toolchains feature might be helpful here https://docs.gradle.org/current/userguide/toolchains.html

[jeremymailen]

Thank you, this is helpful. I guess now jar compatibility requires more than just bytecode – declaring which JDK apis are required by the component. Will try to fix tomorrow.

[mateuszkwiecinski]

Thanks! I can confirm it works, even on Java 8 🚀