Set oldJoins = myJoins; Set newJoins = new PropertyListSet();
List oldJoins = myJoins; List newJoins = new LinkedList();
  public void removeJoin(EOJoin _join) {    Set oldJoins = myJoins;    Set newJoins = new PropertyListSet();    newJoins.addAll(myJoins);    newJoins.remove(_join);    myJoins = newJoins;    firePropertyChange(EORelationship.JOINS, oldJoins, newJoins);    _join._setRelationship(null);  }