Currently the output is as follows:
Nov 07, 2011 6:34:17 PM org.jdesktop.beansbinding.util.logging.Logger log
Warnung: addPropertyChangeListener(): can't add listener

It would be much better if the message told on which class it failed, so the implementation can be fixed more easily. The desired message looks like this:
Nov 07, 2011 6:34:17 PM org.jdesktop.beansbinding.util.logging.Logger log
Warnung: addPropertyChangeListener(): can't add listener on class [some.package.SomeClass].

Or maybe some more user friendly:
Nov 07, 2011 6:34:17 PM org.jdesktop.beansbinding.util.logging.Logger log
Warnung: addPropertyChangeListener(): can't add listener on class [some.package.SomeClass]. Please add the method signature [addPropertyChangeListener(java.beans.PropertyChangeListener)] to fix this.

This is the fixed method in ELProperty.java:
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/**

• @throws PropertyResolutionException
  */
  private static void addPropertyChangeListener(Object object,
  PropertyChangeListener listener) {
  EventSetDescriptor ed = getEventSetDescriptor(object);
  Method addPCMethod = null;

if ((ed == null) || ((addPCMethod = ed.getAddListenerMethod()) == null)) { logger.warning("addPropertyChangeListener(): can't add listener on class "+object.getClass().getName()); return; }

invokeMethod(addPCMethod, object, listener);
}
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