Many-to-Many query jpql

Question

I have the followed trouble.

There is an entity Distributor who is connected with the ManyToMany relationship to entity town:

@Entity
public class Distri         


        

Answer 1

First, from the entity Town, there is incorrect relationship mapping for @Manytoone. Should be:

@Entity
public class District {

  .....

   @ManyToOne
   private Town town;

   ....
}

Answer 2

select distinct distributor 
from Distributor distributor  
join distributor.towns town 
join town.district district 
where district.name = :name

See: https://en.wikibooks.org/wiki/Java_Persistence/JPQL