Configuring entityLookup for MyEntity breaks /myEntities/id (can be fixed by registering a BackendIdConverter). [DATAREST-1487]

jvanheesch opened DATAREST-1487 and commented

Please see reference url for quick reproducer.

1st commit: I defined entities Book and Author, book has an author, and all endpoints were working.
2nd commit: I configured EntityLookup for AuthorRepository, which breaks the /authors/2 endpoint, resulting in 

{
  "cause": null,
  "message": "class java.lang.String cannot be cast to class java.lang.Long (java.lang.String and java.lang.Long are in module java.base of loader 'bootstrap')"
}

3rd commit: I registered a BackendIdConverter for the Author class, which converts the String to a Long and vice versa, fixing /authors/2.

I assume this is considered a bug. If it's not, the issue type may be changed to 'Improvement'

Reference URL: https://github.com/jvanheesch/spring-data-rest-entitylookup-backend-id-converter