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我有以下类ProtokollEvent

public class ProtokollEvent extends Event {

//variable holds all devices in given protokoll
private ObservableList<Device> devicesList;

//variable holds SaveResult
private SaveResult result;

//final ProtokollEvents
public static final EventType<ProtokollEvent> PROTOKOLL_SAVE = new EventType(ANY, "PROTOKOLL_SAVE");
public static final EventType<ProtokollEvent> PROTOKOLL_SAVE_DONE = new EventType(ANY, "PROTOKOLL_SAVE_DONE");
public static final EventType<ProtokollEvent> PROTOKOLL_UPDATED = new EventType(ANY, "PROTOKOLL_UPDATED");
public static final EventType<ProtokollEvent> PROTOKOLL_DELETED = new EventType(ANY, "PROTOKOLL_DELETED");

public ProtokollEvent() {
    this(PROTOKOLL_SAVE);
}

public ProtokollEvent(EventType<? extends Event> arg0) {
    super(arg0);
}

public ProtokollEvent(Object arg0, EventTarget arg1, EventType<? …