Program: 16023
Project: 16023
Buggy source:
/** 
 * Renders the beginning JavaScript code snippet for the component. It must be called before rendering the children.
 * @param clientEvents a collection of client events.It is ignored if lookup is true.
 * @param lookup whether to look up instead of creating a widget.Specifies true if the widget is created somewhere else.
 */
public void renderBegin(Component comp,Map clientEvents,boolean lookup){
  if (_2ndChild.isEmpty())   _jsout.append("String_Node_Str");
 else   if (_2ndChild.get(0) == Boolean.TRUE)   _2ndChild.set(0,Boolean.FALSE);
 else   _jsout.append(',');
  _2ndChild.add(0,Boolean.TRUE);
  _jsout.append("String_Node_Str");
  final String wgtcls=lookup ? "String_Node_Str" : comp.getWidgetClass();
  if (!"String_Node_Str".equals(wgtcls))   _jsout.append('\'').append(wgtcls).append('\'');
 else   _jsout.append(1);
  _jsout.append("String_Node_Str").append(comp.getUuid()).append("String_Node_Str");
  if (!lookup) {
    boolean first=true;
    final String id=comp.getId();
    if (id.length() > 0) {
      first=false;
      _jsout.append("String_Node_Str").append(Strings.escape(id,Strings.ESCAPE_JAVASCRIPT)).append('\'');
    }
    if (!comp.isVisible()) {
      if (first)       first=false;
 else       _jsout.append(',');
      _jsout.append("String_Node_Str");
    }
    if (clientEvents != null) {
      for (Iterator it=clientEvents.entrySet().iterator(); it.hasNext(); ) {
        final Map.Entry me=(Map.Entry)it.next();
        final String evtnm=(String)me.getKey();
        final int flags=((Integer)me.getValue()).intValue();
        if ((flags & ComponentCtrl.CE_IMPORTANT) != 0 || Events.isListened(comp,evtnm,false)) {
          if (first)           first=false;
 else           _jsout.append(',');
          _jsout.append('$').append(evtnm).append(':').append(Events.isListened(comp,evtnm,true));
        }
      }
    }
  }
  _jsout.append("String_Node_Str");
}

Fixed version (ground truth):
/** 
 * Renders the beginning JavaScript code snippet for the component. It must be called before rendering the children.
 * @param clientEvents a collection of client events.It is ignored if lookup is true.
 * @param lookup whether to look up instead of creating a widget.Specifies true if the widget is created somewhere else.
 */
public void renderBegin(Component comp,Map clientEvents,String specialRendererOutput,boolean lookup){
  if (_2ndChild.isEmpty())   _jsout.append("String_Node_Str");
 else   if (_2ndChild.get(0) == Boolean.TRUE)   _2ndChild.set(0,Boolean.FALSE);
 else   _jsout.append(',');
  _2ndChild.add(0,Boolean.TRUE);
  _jsout.append("String_Node_Str");
  final String wgtcls=lookup ? "String_Node_Str" : comp.getWidgetClass();
  if (!"String_Node_Str".equals(wgtcls))   _jsout.append('\'').append(wgtcls).append('\'');
 else   _jsout.append(1);
  _jsout.append("String_Node_Str").append(comp.getUuid()).append("String_Node_Str");
  if (!lookup) {
    boolean first=true;
    final String id=comp.getId();
    if (id.length() > 0) {
      first=false;
      _jsout.append("String_Node_Str").append(Strings.escape(id,Strings.ESCAPE_JAVASCRIPT)).append('\'');
    }
    if (!comp.isVisible()) {
      if (first)       first=false;
 else       _jsout.append(',');
      _jsout.append("String_Node_Str");
    }
    if (clientEvents != null) {
      for (Iterator it=clientEvents.entrySet().iterator(); it.hasNext(); ) {
        final Map.Entry me=(Map.Entry)it.next();
        final String evtnm=(String)me.getKey();
        final int flags=((Integer)me.getValue()).intValue();
        if ((flags & ComponentCtrl.CE_IMPORTANT) != 0 || Events.isListened(comp,evtnm,false)) {
          if (first)           first=false;
 else           _jsout.append(',');
          _jsout.append('$').append(evtnm).append(':').append(Events.isListened(comp,evtnm,true));
        }
      }
    }
    if (!Strings.isEmpty(specialRendererOutput)) {
      if (first)       first=false;
 else       _jsout.append(',');
      _jsout.append(specialRendererOutput);
    }
  }
 else   if (!Strings.isEmpty(specialRendererOutput)) {
    _jsout.append(specialRendererOutput);
  }
  _jsout.append("String_Node_Str");
}