java - Hibernate bidirectional @ManyToOne, updating the not owning side not working -


I have a very simple setup to try bidirectional mapping with annotations: 

 < Code> @ entity public class type a abber modell and lieutenant; Type A & gt; {@Id @GeneratedValue Private INAD; @OneToMany (mapped = "A") private collection & lt; TypeB & gt; Bs; // Gates & amp; Setters ...}   
 and  
  @EntiType public class TypeB abber modell extension & lt; TypeB & gt; {Private Stable Last Long Serial Year UID = 3526384868922938604 L; @ ID @ Generated Private Private ID; @ManyToOne () @ Zone column (name = "A_ID") Private type AA; }   
 When I set property TypeA.bs it does not affect mapping, although this should look like the following example:    TypeB b = new TypeB (); This.typeBDao.save (b); TypeA a = new type A (); A.setBs (ListUtils.createList (b)); Println (a.getBs ()); // Output: [TypeB @ 25fe4d40] this.typeADao.save (a); Println (a.getBs ()); // Output: [TypeB @ 25fe4d40] this.Typeadao.refresh (a); Println (a.getBs ()); // Output: [] This Type BDO.refresh (b); Println (b.getA ()); // Output: blank   
 If the mapping is bidirectional, the collection must be populated and the property should be updated B, but it is not. Any ideas?  
  Edit  Thank you for helping people, I got it now!   
 
 
 For a consistent domain model, you should always set both sides of the relationship, such as:  
  TypeB b = new TypeB (); TypeA a = new type A (); A.setBs (ListUtils.createList (b)); B.setA (a); This.typeBDao.save (b); This.typeADao.save (a);   
 When your institutions are in an incompatible situation, then the JPA will always collect the values ​​according to the object's condition of the owner side of the JPA relationship. In this case type B is the owner of the type of type. Thus if there is no reference to an object type A of TypeB, then the JPA assumes that no relation is defined.

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