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

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Check all of the places where you are assigning something to sonEntities. The link you referenced distinctly points out creating a new HashSet but you can have this error anytime you reassign the set. For example:

public void setChildren(Set<SonEntity> aSet)
{
    this.sonEntities = aSet; //This will override the set that Hibernate is tracking.
}

Usually you want to only “new” the set once in a constructor. Any time you want to add or delete something to the list you have to modify the contents of the list instead of assigning a new list.

To add children:

public void addChild(SonEntity aSon)
{
    this.sonEntities.add(aSon);
}

To remove children:

public void removeChild(SonEntity aSon)
{
    this.sonEntities.remove(aSon);
}

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