@Override
 public String toString() {
   StringBuilder sb = new StringBuilder();
   sb.append("[Bean, list ");
   if (_beans == null) {
     sb.append("NULL");
   } else {
     sb.append('(').append(_beans.size()).append('/');
     sb.append(_beans.getClass().getName()).append(") ");
     boolean type = false;
     for (CtorValueBean bean : _beans) {
       if (!type) {
         sb.append("(").append(bean.getClass().getSimpleName()).append(")");
         type = true;
       }
       sb.append(bean);
       sb.append(' ');
     }
   }
   sb.append(']');
   return sb.toString();
 }