Query methods with dynamic projections which return Optional, Stream or Page throw NoSuchElementException [DATAJPA-1185]

[spring-projects-issues]

Sergei Poznanski opened DATAJPA-1185 and commented

Query methods with dynamic projections, which return Optional, Stream or Page, throw NoSuchElementException

For example:

public interface CommentRepo extends JpaRepository<Comment, Integer> {
	// doesn't work - throw NoSuchElementException
	<T> Optional<T> findByUserName(String name, Class<T> type);
	<T> Page<T> getAllByTextLike(Pageable pageable, String text, Class<T> type);
        <T> Stream<T> findStreamByTextLike(String text, Class<T> type);
}

Project example and tests

P.S. Also the documentation has an error in the Dynamic projections topic - the repo method must start with type parameter:

interface PersonRepository extends Repository<Person, UUID> {

   <T> Collection<T> findByLastname(String lastname, Class<T> type);
}

---

Affects: 1.11.7 (Ingalls SR7)

Reference URL: https://github.com/Cepr0/sd-jpa-projections/blob/master/src/main/java/io/github/cepr0/projections/repo/CommentRepo.java

Issue Links:

• DATACMNS-1177 Parameter.isDynamicProjectionParameter() does not handle wrapper types properly
  ("depends on")

Referenced from: pull request #223

Backported to: 1.11.9 (Ingalls SR9)

1 votes, 5 watchers

[spring-projects-issues]

Marcel Overdijk commented

This PR (spring-projects/spring-data-examples#295) provides a failing test caused by this issue

[spring-projects-issues]

Marcel Overdijk commented

Is this something considered for 2.0 (Kay) release?

[spring-projects-issues]

Jens Schauder commented

That's the current plan and we'll have a backport as well

[spring-projects-issues]

Marcel Overdijk commented

OK great to hear!

[spring-projects-issues]

Jens Schauder commented

PR for backport #222

[spring-projects-issues]

Oliver Drotbohm commented

The backport branch doesn't rebase cleanly onto current 1.12.x, would you mind resolving that? I'll push the merge for master in the meantime

[spring-projects-issues]

Jens Schauder commented

Wasn't sure if you were done with the existing branch, therefore created a new one:

https://github.com/spring-projects/spring-data-jpa/tree/issue/1.12.x/DATAJPA-1185