picocli-codegen is missing provides ... with for service registration

[blazmrak]

codegen module does not have service registration statement and it isn't picked up when using --processor-module-path.

Unless I'm misunderstanding how modules work, this should be added to module-info.java:

...
provides javax.annotation.processing.Processor with picocli.codegen.aot.graalvm.processor.NativeImageConfigGeneratorProcessor;
...

[remkop]

Hi @blazmrak thank you for raising this!
Can you provide a pull request, and ideally add a failing test to picocli-tests-jpms-modules (that will pass after the fix)?

[blazmrak]

Ok, I'll try 😄 How does the test for this look? Do I just exec javac, or is there something smarter that I can do?