Spring spel in open projection

Question

My goal is to combine map from some spring data projection. Entity:

@Entity
public class Parent {
// id, getters and boilerplate

private List<Child> childs
}

and projection be like:

interface ParentProjection{
@Value("target.childs == null ? null : {target.childs![name]: target.childs![id'})
Map<String,Long> getChildNameAndId();
}

It compiles but when it reaches getChildAndId() in application it falls with : java.lang.IllegalArgumentException: Projection type must be an interface!

score 1 · Answer 1 · answered Nov 23 '22 at 09:04

1

You can search Stackoverflow, there are similar questions with answers that might help you:
"java.lang.IllegalArgumentException: Projection type must be an interface" Error

Spring JPA - "java.lang.IllegalArgumentException: Projection type must be an interface!" (using native query)

answered Nov 23 '22 at 09:04

Uri Loya

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I ve checked these treads before and after your comment. They didn't clear the problem, though. – tarmogoyf Nov 23 '22 at 09:08
Still relevant. – tarmogoyf Nov 24 '22 at 06:41

Spring spel in open projection

1 Answers1