Program: 15846
Project: 15846
Buggy source:
public void render(final Comboitem item,final Object data,final int index) throws Exception {
  final Combobox cb=(Combobox)item.getParent();
  final ListModel<?> model=cb.getModel();
  final int size=model.getSize();
  final Template tm=resolveTemplate(cb,item,data,index,size,"String_Node_Str");
  if (tm == null) {
    item.setLabel(Objects.toString(data));
    item.setValue(data);
  }
 else {
    final ForEachStatus iterStatus=new AbstractForEachStatus(){
      private static final long serialVersionUID=1L;
      public int getIndex(){
        return index;
      }
      public Object getCurrent(){
        return data;
      }
      public Integer getEnd(){
        return size;
      }
    }
;
    final String var=(String)tm.getParameters().get(EACH_ATTR);
    final String varnm=var == null ? EACH_VAR : var;
    final String itervar=(String)tm.getParameters().get(STATUS_ATTR);
    final String itervarnm=itervar == null ? (var == null ? EACH_STATUS_VAR : varnm + STATUS_POST_VAR) : itervar;
    Object oldVar=cb.getAttribute(varnm);
    Object oldIter=cb.getAttribute(itervarnm);
    cb.setAttribute(varnm,data);
    cb.setAttribute(itervarnm,iterStatus);
    final Component[] items=filterOutShadows(cb,tm.create(cb,item,null,null));
    if (oldVar == null) {
      cb.removeAttribute(varnm);
    }
 else {
      cb.setAttribute(varnm,oldVar);
    }
    if (oldIter == null) {
      cb.removeAttribute(itervarnm);
    }
 else {
      cb.setAttribute(itervarnm,oldIter);
    }
    if (items.length != 1)     throw new UiException("String_Node_Str" + items.length);
    final Comboitem nci=(Comboitem)items[0];
    nci.setAttribute(BinderCtrl.VAR,varnm);
    if (model instanceof ListSubModel) {
      nci.setAttribute(varnm,data);
    }
 else {
      recordRenderedIndex(cb,items.length);
      nci.setAttribute(AbstractRenderer.IS_TEMPLATE_MODEL_ENABLED_ATTR,true);
      nci.setAttribute(AbstractRenderer.CURRENT_INDEX_RESOLVER_ATTR,new IndirectBinding(){
        public Binder getBinder(){
          return BinderUtil.getBinder(nci,true);
        }
        @SuppressWarnings("String_Node_Str") public void setValue(        BindELContext ctx,        Object value){
          int idx=BindComboitemRenderer.this.getRenderedIndex(cb,nci.getIndex());
          ListModel<?> listmodel=cb.getModel();
          if (idx >= 0 && idx < listmodel.getSize()) {
            if (listmodel instanceof ListModelArray) {
              ((ListModelArray<Object>)listmodel).set(idx,value);
            }
 else             if (listmodel instanceof ListModelList<?>) {
              ((ListModelList<Object>)listmodel).set(idx,value);
            }
          }
 else {
          }
        }
        public Component getComponent(){
          return nci;
        }
        public Object getValue(        BindELContext ctx){
          return model.getElementAt(BindComboitemRenderer.this.getRenderedIndex(cb,nci.getIndex()));
        }
      }
);
      addItemReference(cb,nci,index,varnm);
    }
    nci.setAttribute(itervarnm,iterStatus);
    nci.setAttribute(TemplateResolver.TEMPLATE_OBJECT,item.removeAttribute(TemplateResolver.TEMPLATE_OBJECT));
    addTemplateTracking(cb,nci,data,index,size);
    if (nci.getValue() == null)     nci.setValue(data);
    item.setAttribute(Attributes.MODEL_RENDERAS,nci);
    item.detach();
    Events.sendEvent(new Event(BinderCtrl.ON_BIND_INIT,nci));
  }
}

Fixed version (ground truth):
public void render(final Comboitem item,final Object data,final int index) throws Exception {
  final Combobox cb=(Combobox)item.getParent();
  final ListModel<?> model=cb.getModel();
  final int size=model.getSize();
  final Template tm=resolveTemplate(cb,item,data,index,size,"String_Node_Str");
  if (tm == null) {
    item.setLabel(Objects.toString(data));
    item.setValue(data);
  }
 else {
    final ForEachStatus iterStatus=new AbstractForEachStatus(){
      private static final long serialVersionUID=1L;
      public int getIndex(){
        return index;
      }
      public Object getCurrent(){
        return data;
      }
      public Integer getEnd(){
        return size;
      }
    }
;
    final String var=(String)tm.getParameters().get(EACH_ATTR);
    final String varnm=var == null ? EACH_VAR : var;
    final String itervar=(String)tm.getParameters().get(STATUS_ATTR);
    final String itervarnm=itervar == null ? (var == null ? EACH_STATUS_VAR : varnm + STATUS_POST_VAR) : itervar;
    Object oldVar=cb.getAttribute(varnm);
    Object oldIter=cb.getAttribute(itervarnm);
    cb.setAttribute(varnm,data);
    cb.setAttribute(itervarnm,iterStatus);
    final Component[] items=filterOutShadows(cb,tm.create(cb,item,null,null));
    if (oldVar == null) {
      cb.removeAttribute(varnm);
    }
 else {
      cb.setAttribute(varnm,oldVar);
    }
    if (oldIter == null) {
      cb.removeAttribute(itervarnm);
    }
 else {
      cb.setAttribute(itervarnm,oldIter);
    }
    if (items.length != 1)     throw new UiException("String_Node_Str" + items.length);
    final Comboitem nci=(Comboitem)items[0];
    nci.setAttribute(BinderCtrl.VAR,varnm);
    if (model instanceof ListSubModel) {
      nci.setAttribute(varnm,data);
    }
 else {
      recordRenderedIndex(cb,items.length);
      nci.setAttribute(AbstractRenderer.IS_TEMPLATE_MODEL_ENABLED_ATTR,true);
      nci.setAttribute(AbstractRenderer.CURRENT_INDEX_RESOLVER_ATTR,new IndirectBinding(){
        public Binder getBinder(){
          return BinderUtil.getBinder(nci,true);
        }
        @SuppressWarnings("String_Node_Str") public void setValue(        BindELContext ctx,        Object value){
          ListModel<?> listmodel=cb.getModel();
          int idx=((ListModelArray<Object>)listmodel).indexOf(data);
          if (listmodel instanceof ListModelArray) {
            ((ListModelArray<Object>)listmodel).set(idx,value);
          }
 else           if (listmodel instanceof ListModelList<?>) {
            ((ListModelList<Object>)listmodel).set(idx,value);
          }
        }
        public Component getComponent(){
          return nci;
        }
        public Object getValue(        BindELContext ctx){
          return data;
        }
      }
);
      addItemReference(cb,nci,index,varnm);
    }
    nci.setAttribute(itervarnm,iterStatus);
    nci.setAttribute(TemplateResolver.TEMPLATE_OBJECT,item.removeAttribute(TemplateResolver.TEMPLATE_OBJECT));
    addTemplateTracking(cb,nci,data,index,size);
    if (nci.getValue() == null)     nci.setValue(data);
    item.setAttribute(Attributes.MODEL_RENDERAS,nci);
    item.detach();
    Events.sendEvent(new Event(BinderCtrl.ON_BIND_INIT,nci));
  }
}