Quarkus Spring Data DTO and Projections support

[engilyin]

Describe the bug
Spring Data API supports DTO and Projections.
Here you can read how it should work:
https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#projections

Expected behavior
DTO and Projections should work

Actual behavior
It just try to retrieve the full object and fails with Cast error:

Caused by: java.lang.ClassCastException: class org.acme.entities.Contact cannot be cast to class org.acme.data.SimpleContactProjection (org.acme.entities.Contact and org.acme.data.SimpleContactProjection are in unnamed module of loader io.quarkus.bootstrap.classloading.QuarkusClassLoader @363f6148)

To Reproduce
Please check this repo:
https://github.com/engilyin/quarkus-spring-dto.git

All tests should be passed (build succeed):
./gradlew clean build

Also you can find commented out stuff in this repo. That was my try to use dynamic projections/DTO.
It breaks build at all.

Environment (please complete the following information):

• Output of uname -a or ver: Darwin MacBook-Pro-Alexander.local 19.6.0 Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64 x86_64

• Output of java -version: openjdk 11.0.5 2019-10-15 LTS

• Quarkus version or git rev: 1.9.1.Final

• Build tool (ie. output of mvnw --version or gradlew --version): Gradle 6.6.1

[quarkusbot]

/cc @geoand

[engilyin]

Does not look like this issue was fixed.
Keep getting this error for my tests.

org.acme.resteasy.ContactResourceTest > testDto() FAILED
    java.lang.RuntimeException: java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
        [error]: Build step io.quarkus.spring.data.deployment.SpringDataJPAProcessor#build threw an exception: java.lang.IllegalArgumentException: findByUsername of Repository org.acme.repositories.SimpleContactDtoRepository can only use interfaces to map results to non-entity types.
        at io.quarkus.spring.data.deployment.generate.DerivedMethodsAdder.add(DerivedMethodsAdder.java:187)
        at io.quarkus.spring.data.deployment.generate.SpringDataRepositoryCreator.implementCrudRepository(SpringDataRepositoryCreator.java:116)
        at io.quarkus.spring.data.deployment.SpringDataJPAProcessor.implementCrudRepositories(SpringDataJPAProcessor.java:273)
        ```

[geoand]

Can you create a new issue and include a project that reproduces the behavior you mention?