Beginner's question:

I have in an entity "FThread":

@OneToMany(cascade=CascadeType.ALL, mappedBy="fthread")
public List<Post> getPosts() {
 if(posts == null) posts = new ArrayList<Post>();
 return posts;
}

My sfsb "ThreadManager" has an extended persistence context and I verified that my fthread is currently managed when I call

fthread.getPosts().clear();

What is missing that the posts are not removed from the database?

Thank you!
sonja