Jdk8 variant of this plugin?

[kkocel]

Recently I tried to use the newest version of gradle-integration-test-plugin and it failed since the project where I applied it had jdk8.

I got the following error message:

No matching variant of com.coditory.gradle:integration-test-plugin:1.2.1 was found. The consumer was configured to find a runtime of a library compatible with Java 8, packaged as a jar, and its dependencies declared externally, as well as attribute 'org.gradle.plugin.api-version' with value '7.0.1' but:
          - Variant 'apiElements' capability com.coditory.gradle:integration-test-plugin:1.2.1 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 11 and the consumer needed a runtime of a component compatible with Java 8

Logs can be found here:
https://github.com/allegro/axion-release-plugin/runs/3008018485

Is there a possibility to make this library jdk8 compatible?

[pmendelski]

I tried to find a solution to this issue (except downgrading dependencies), but I found none.
I will release a fix as soon as I find official workaround.
Till that time I'm open for suggestions or PRs.

[kkocel]

Just a wild guess (haven't tried it etc.) but maybe you could define JVM toolchain? https://docs.gradle.org/current/userguide/toolchains.html

[kkocel]

@pmendelski This PR may help: #8

[pmendelski]

@kkocel Many thanks for the very first external contribution to this project 🎉

I've just released the plugin under v1.2.3.
Please let me know if it works with your project.

[kkocel]

I checked it with the axion plugin and it works.

Why it's working?

It turns out that Gradle started to publish Gradle Module Metadata which is superior to pom files.

Inside pom file you can read:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <!-- This module was also published with a richer model, Gradle metadata,  -->
  <!-- which should be used instead. Do not delete the following line which  -->
  <!-- is to indicate to Gradle or any Gradle module metadata file consumer  -->
  <!-- that they should prefer consuming it instead. -->
  <!-- do_not_remove: published-with-gradle-metadata -->

Gradle Module Metadata declares which JVM version was used to build the library, and since you used Java 11:

 "org.gradle.jvm.version": 11,

So defining explicit version in the JVM toolchain and updating GitHub workflow did the trick :)