src/main/java/org/jboss/util/property/PropertyMap.java
public Set keySet(final boolean includeDefaults)
   {
      if (includeDefaults)
      {
         Set set = new HashSet();
         set.addAll(defaults.keySet());
         set.addAll(super.keySet());
         return Collections.synchronizedSet(set);
      }

      return super.keySet();
   }
public Set keySet(final boolean includeDefaults)
   {
      if (includeDefaults)
      {
         Set set = new HashSet();
         set.addAll(defaults.keySet());
         set.addAll(super.keySet());
         return Collections.synchronizedSet(set);
      }

      return super.keySet();
   }
Returns a set of keys for all entries in this group and optionally
all of the keys in the defaults map.
@param includeDefaults
@return the key set