Expose method to obtain the repository query method return type [DATACMNS-1738]

[spring-projects-issues]

Mark Paluch opened DATACMNS-1738 and commented

Obtaining a method return type usually works using Method.getReturnType except for suspended Kotlin methods (e.g. suspend fun foo()) as Kotlin changes the bytecode signature to return Object and the return type is synthesized as method argument through the generic parameter of Continuation<...>.

Therefore, obtaining the return type for a suspended method requires an inspection of the method parameters. We should provide a utility method in RepositoryMetadata so that we can reuse this functionality from store modules

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Affects: 2.3 GA (Neumann), 2.4 M1 (2020.0.0)

Issue Links:

• DATAMONGO-2562 CoroutineCrudRepository findAllBy throwing IncorrectResultSizeDataAccessException when more than 1 result
  ("is depended on by")

Backported to: 2.3.1 (Neumann SR1)