Unable to locate appropriate constructor error for nested list object in kotlin and JpaRepository

Question

I\'m facing the following error when JPA attempts to map the result from a query to the result repository method DTO:

org.hibernate.hql.internal.ast.QuerySyntaxE         


        

Answer 1

Why does your JdbcUserRepository returns a User object for findUserByUsername and not a DbUser? The solution should be obvious:

override fun findUserByUsername(username: String): DbUser?

And you do the mapping afterwards manually.

You should think that people know why they introduced multiple representations of the same object instead of using a single representation as long as possible...