maven: Immutable classes do not exist after mvn generate-sources -> problem with querydsl

[hubchenfox]

Steps to reproduce

1. Use Immutables (within JPA entities) and QueryDSL together
2. Run mvn clean generate-sources
3. Immutables are not generated in this step
4. QueryDSL (which generates the metamodel classes in the correct phase generate-sources) expects the Immutables and write error messages during the maven generate-sources phase

Note: The mvn install leads to a correct build, but error messages should be avoided

Wanted solution:
Immutable classes should be generated in the maven step "generate-sources"
This has also the advantage that even in case of compile errors the Immutables already exists and the "real error" does not hide between lots of "Immutable not found" errors.

[yatesco]

I think I ran into a similar problem typetools/checker-framework#5143

[hubchenfox]

Quote @yatesco

I think I ran into a similar problem typetools/checker-framework#5143
Thanks for the link.
As far as I understood it, it was about two different plugins both being executed in the maven lifecycle compile, but one of them was no longer executed.
Your solution from the link:
If you run "mvn clean generate-sources", the autogenerated classes of both plugins are "missing", aren't they?
I have now got QueryDSL to generate the classes in the compile lifecylce (annotationProcessor) only but this has other disadvantages and that is why I am not so happy with it

[yatesco]

Yes, it was exactly that. The solution was to use "auto discovery" of the annotation processors.