I'm having problems with the eventListenerList.remove(c,
eventListeners[i + 1]).

What should i do to cast it?

public void removeAllListeners(Class c) {
  Object[] eventListeners = eventListenerList.getListenerList();
  for (int i = eventListeners.length - 2; i >= 0; i -= 2) {
    if (eventListeners[i] == c) {
      eventListenerList.remove(c, eventListeners[i + 1]);
    }
  }
}