JPA query with @ManyToMany relationship and no navigation

问题

Similar to this post, I have these (almost the same) classes:

public class Project {
    @ManyToMany 
    private Set<Person> resources;
    // get and set of resources
}
public class Person {
}

The difference is that my properties are private (using beans as entities).

The question is: how would I create a query to return all projects of a determined person (in JPQL and/or using CriteriaQuery)?

I found all these other similar questions, but none helped me, because all of them rely on the navigation from Project to Person (which doesn't exist querying from Person):

• JPQL ManyToMany select
• @ManyToMany JPA 2 complex query
• JPA 2.0 CriteriaQuery on tables in @ManyToMany relationship

I wouldn't like to insert a property inside 'Person' just to be able to make the query, because it doesn't make sense in my model.

Thanks!!

回答1:

select project from Project project
join project.resources person
where person.id = :personId

I'll let you translate this to criteria if you really want it, but I don't hink using Criteria for such a basic static query offers any advantage.

来源：https://stackoverflow.com/questions/22052537/jpa-query-with-manytomany-relationship-and-no-navigation