Hibernate: Cascade Type

Question

Let\'s I have entity A and entity B. Entity A have @OneToOne relationship with B.
I want do next:
if

Answer 1

if A "has" B, then you must define CascadeType.ALL in A:

public class A {
  // changes to A cascade to B
  @OneToOne(cascade = {CascadeType.ALL})
  B b
}

Answer 2

If Class A has Class B then CascadeType.ALL will be appiled on B. then

Public Class A
{
  Private B b;
  @OneToOne(cascade = CascadeType.ALL)   
  public B getB() {       
    return this.b;   
   }     
  public void B(B b) {         
    this.b = b;   
  }
}

for more read this example

Answer 3

The cascade from A to B should be placed on the field referencing B in class A, the cascade from B to A should be placed on the field referencing A in class B.

public class A {
    @OneToOne(cascade = {CascadeType.ALL})
    B b;
}

Should be in class A, as you want every action to be cascaded to B.

public class B {
    @OneToOne(cascade = {CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH})
    A a;
}

Should be in class B, as you only want certain actions cascaded to A