sdn-recursive-projection-bug

SDN is unable to save nodes using a projection that recursively references itself.

For example, say you have a node entity that recursively references itself

@Getter
@Node
public class Person {
  private String name;

  private List<Person> children = new LinkedList<>();
}

And a corresponding projection that references itself as well

public interface PersonWithChildrenRecursive {
  String getName();

  List<PersonWithChildrenRecursive> getChildren();
}

You cannot save a node using this projection

Person alice = new Person();
alice.setName("Alice");
neo4jTemplate.saveAs(alice, PersonWithChildrenRecursive.class); // throws StackOverflowError

Note that other ways to save will succeed, such as CrudRepository.save or Neo4jTemplate.saveAs with a projection that is not recursive.

I don't know if this a new bug or a regression. I noticed it first while using 6.3.3-SNAPSHOT but the bug is present in 6.3.2 as well.

Requirements

Don't forget to set database credentials in application.properties.

Tests

Run tests via mvn clean install or via an IDE.