A collection with cascade=“all-delete-orphan” was no longer referenced by the owning entity instance

Question

In my application, a hibernate operation goes like this. The application updates a parent entity with new values from the request and deletes all the existing (previously insert

Answer 1

instead of setChilds use addAll ,

from this,

    parent.getChilds().clear();
    parent.setChilds(newChilds);

to

    parent.getChilds().clear();
    parent.getChilds().addAll(newChilds);

Answer 2

It worked for me.

1. Cleared all my child entities.

2. Instead of setting the new child entities to my parent object, I have used addAll method to add the new child entities.

   parent.getChildren().clear();
   parent.getChildren().addAll(newChildrenList);
   
   @OneToMany(mappedBy = "parent", fetch = FetchType.LAZY, 
              cascade = CascadeType.ALL, orphanRemoval = true)  
   
   public Set<Children> getChildren() {
       return this.children;
   }
   

Answer 3

Your last snippet of Java code doesn't compile. I guess it looks like

parent.getChilds().clear(); // note: you should name it children rather than childs
parent.setChilds(someNewSetOfChildren):

Don't do the last instruction. Instead of replacing the set by another one, clear the set and add the new children to the cleared set:

parent.clearChildren();
parent.addChildren(someNewSetOfChildren);

where the methods are defined as:

public void clearChildren() {
    this.children.clear();
}

public void addChildren(Collection<Child> children) {
    this.children.addAll(children);
}

The setChildren method should be removed completely, or it should be replaced with the following implementation:

public void setChildren(Collection<Child> children) {
    this.children.clear();
    this.children.addAll(children);
}

Answer 4

I faced the same issue and get it solved as follows:

1- add {CascadeType.ALL}, orphanRemoval=true in all @OneToMany annotations in all entity Childs of that element.

2- Check the hashcode() and equalls() of those entities, some times they have erros

3- Don't use parent.setChilds(newChilds); as the engine will ask for missing the reference to the childs, but use instead use

parent.getChilds().clear();
parent.getChilds().add(Child);

or

parent.getChilds().addAll(Childs);

Those steps solved my issue after 4 Hours of research

Answer 5

it change works !

@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true)
@JoinColumn(name = "user_id")
private List<Role> roles;