Add Support of Spring Data JPA specific JpaSpecificationExecutor

[hantsy]

Quarkus 0.22.0

I just tried Spring Data JPA feature, the first limitation is JpaSpecificationExecutor does not work.

https://github.com/hantsy/quarkus-sample/tree/master/spring-post-service

public interface PostRepository extends JpaRepository<Post, String>//, JpaSpecificationExecutor<Post>
{

}

[geoand]

We have made it clear that not everything from Spring Data will work on Quarkus.
Can you give some details about how you usually use JpaSpecificationExecutor?

[hantsy]

Some like the purpose I described in issue #4016 and #3965.

JpaSpecificationExecutor is to support JPA Criteria and also introduces a great Specification (a DDD concept) to satisfy Type-safe query requirements.

Many developers are practicing Typesafe query instead of string based query in development.eg. QueryDSL, JPA Criteria, JOOQ etc.

[geoand]

Thanks for the info.

When we have a general strategy around how Panache will handle such Typesafe handling, we can revisit this

[hantsy]

@geoand Micronaut Data ports this Specification concept(a type safe approach to compose the query criteria) to almost all data modules, including Data Jdbc, Data R2dbc, and Data Hibernate Reactive.

[Michael-AT-Corporation]

@geoand I suppose it is still nowhere near to be supported, right? Although it would be nice 🙂
Maybe it could be added to the unsupported features in the spring-data-jpa documentation?

[geoand]

@Michael-AT-Corporation correct. We are likely to figure out the type-safe query strategy soon (cc @FroMage).
In the meantime, I opened #42216 to update the docs

[Michael-AT-Corporation]

@geoand Thanks for the info and for updating the documentation 🙂

[geoand]

🙏🏼

[FroMage]

We are adding type-safe queries, but using HQL, not specifications. However thanks for the point, I've noted the use-case.

[pipinet]

@geoand @FroMage @hantsy
Is there support for a JpaSpecificExecutor program? Because currently he can easily support Hibernate Data Repositories.
Micronaut Data also provides similar support.

This allows us to write more convenient、dynamic and typed JPQL。