It will take a moment for me to explain this, so please stay with me. I have table COMMENT that has OneToMany relationship with itself.

@Entity
public class Comment(){
    ...
    @ManyToOne(optional=true, fetch=FetchType.LAZY)
    @JoinColumn(name="REPLYTO_ID")
    private Comment replyTo;

    @OneToMany(mappedBy="replyTo", cascade=CascadeType.ALL)
    private List<Comment> replies = new ArrayList<Comment>();

    public void addReply(NewsFeed reply){        
       replies.add(reply);
       reply.setReplyTo(this);
    }

    public void removeReply(NewsFeed reply){
       replies.remove(reply);
    }
} 

So you can think like this. Each comment can have a List of replies which are also type Comment. Now it is very easy for me to delete the original comment and get the updated list back. All I need to do after delete is this.

allComments = myEJB.getAllComments();  //This will query the db and return updated list

But I am having problem when trying to delete replies and getting the updated list back. So here is how I delete the replies. Inside my managed bean I have

//Before invoke this method, I have the value of originalFeed, and deletedFeed set.
//These original comments are display inside a p:dataTable X, and the replies are
//displayed inside p:dataTable Y which is inside X. So when I click the delete button
//I know which comment I want to delete, and if it is the replies, I will know
//which one is its original post
public void deleteFeed(){
    if(this.deletedFeed != null){
        scholarEJB.deleteFeeds(this.deletedFeed); 
        if(this.originalFeed != null){
            //Since the originalFeed is not null, this is the `replies`
            //that I want to delete
            scholarEJB.removeReply(this.originalFeed, this.deletedFeed);
        }
        feeds = scholarEJB.findAllFeed();
    }        
}

Then inside my EJB scholarEJB, I have

public void removeReply(NewsFeed comment, NewsFeed reply){
    comment = em.merge(comment);
    comment.removeReply(reply);
    em.persist(comment);
}

public void deleteFeeds(NewsFeed e){
    e = em.find(NewsFeed.class, e.getId());
    em.remove(e);
}

When I get out, the entity (the reply) get correctly removed from the database, but inside the feeds List, reference of that reply still there. It only until I log out and log back in that the reply disappear. Please help