code: protected void sanityCheckDescrip ()
      {
          if (_descrip.getComponentIds() == null ||
              _descrip.getComponentIds().length == 0) {
              log.warning("Invalid character descriptor [sprite=" + this +
                          ", descrip=" + _descrip + "].", new Exception());
          }
      }
docs: Makes it easier to track down problems with bogus character descriptors.