ExtJS store加载数据loadexception

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store加载数据，后台数据能用HttpWatch取到，columnmodel的字段列名已更改但是数据显示不出来，页面和后台没报错，store里面进入loadexception。用的ExtJs2.2.1
ExtJS代码

var checkoutTaskAllStore = new Ext.data.JsonStore({
	proxy:new Ext.data.HttpProxy({
		url:'checkoutTask!findAll.action'
	}),
	reader:checkoutTask_reader,
	listeners:{
		beforeload : function(s, options ) {
			alert(0);
		},
		load : function(s, records, options ) {
			alert(111);
		},
		loadexception : function(){
			alert(2);
		} 
	}

});

var checkoutTask_reader = new Ext.data.JsonReader({
	autoLoad:false,
	root:'taskList',
	totalProperty:'count',
},checkout_record);

var checkout_record = Ext.data.Record.create([
	  {name:'pId', type:'int', mapping:'PId'},
	  {name:'pName', mapping:'product',
		  convert:function(val,r){
			  return val.PName;
		  }
	  },
	  {name:'vId', type:'int', mapping:'VId'},
	  {name:'internalVersion',  mapping:'version', 
		  convert:function(val,r){
			  return val.internalversion;
		  }
	  },
	  {name:"externalVersion",  mapping:'version', 
		  convert:function(val,r){
			  return val.externalversion;
		  }
	  },
	  {name:'baselineVersion',  mapping:'version', 
		  convert:function(val,r){
			  return val.baselineverision;
		  }
	  },
	  {name:'uboot', type:'string', mapping:'version', 
		  convert:function(val,r){
			  return val.UBoot;
		  }
	  },
	  {name:'checkoutCreater', mapping:'userByCtUserId', 
		  convert:function(val,r){
			  return val.userName;
		  }
	  },
	  {name:'checkoutHead', mapping:'userByCtCheckoutHead', 
		  convert:function(val,r){
			  return val.userName;
		  }
	  },
	  {name:'ctNum', type:'string', mapping:'ctNum'},
	  {name:'createTime', type:'string', mapping:'ctTime'},
	  {name:'ctState', type:'string', mapping:'ctState'}
]);

var sm1=new Ext.grid.CheckboxSelectionModel();

var checkoutTask_cm = new Ext.grid.ColumnModel([
    sm1,
    {header:'任务编号', width:60, dataIndex:'ctNum', sortable:true},
    {header:'产品名称', width:120, dataIndex:'pName', sortable:true},
    {header:'内部版本号', width:120, dataIndex:'internalVersion'},
    {header:'外部版本号', width:120, dataIndex:'externalVersion'},
    {header:'U-BOOT版本号', width:120, dataIndex:'uboot'},
    {header:'状态', width:60, dataIndex:'ctState', sortable:true},
    {header:'创建人', width:90, dataIndex:'checkoutCreater', sortable:true},
    {header:'责任人', width:90, dataIndex:'checkoutHead', sortable:true},
    {header:'创建时间', width:120, dataIndex:'createTime', sortable:true},
    {header:'操作', width:150, fixed:true, renderer:function(v,m,r){
    	
    }}
]);
var productRoot = new Ext.tree.AsyncTreeNode({
	id:'productRoot',
	text:'所有产品'
});

var productTree = new Ext.tree.TreePanel({
	id:'productTree',
	root:productRoot,
	width:'auto',
	border:false,
	loader:new Ext.tree.TreeLoader({
		dataUrl:'product!findAll.action'
	}),
	listeners:{
		'click':function(node){
			if(node.id == "productRoot"){
				checkoutTaskAllStore.load({
					params:{
						start:0,
						limit:20
					}
				});
				Ext.getCmp('bbar').bind(checkoutTaskAllStore);
				Ext.getCmp('tasklist_grid').reconfigure(checkoutTaskAllStore,checkoutTask_cm);
				Ext.getCmp('tasklist_grid').view.refresh();
			}
		}
	}
});

后台Action

public String findAll(){
		taskList = checkoutTaskService.findAll(limit, start);
		count = taskList.get(0).getCtId();
		taskList.remove(0);		
		return SUCCESS;
	}

DAO方法

@Override
	public List findAll(final int limit, final int start) {
		final String hql = "from CheckoutTask order by ctId DESC";
		@SuppressWarnings("unchecked")
		List<CheckoutTask> list = getHibernateTemplate().executeFind(new HibernateCallback() {
			
			public Object doInHibernate(Session session)
					throws HibernateException, SQLException {
				Query query = session.createQuery(hql);
				int count=query.list().size();
				query.setFirstResult(start);
				query.setMaxResults(limit);
				CheckoutTask task=new CheckoutTask();
				task.setCtId(count);
				List<CheckoutTask> l = new ArrayList<CheckoutTask>();
				l.add(task);
				Iterator ite=query.list().iterator();
				for(;ite.hasNext();){
					CheckoutTask task1=(CheckoutTask)ite.next();
					l.add(task1);
				}
				return l;
			}
		});
		return list;
}

HttpWatch获取的json数据

{"count":2,"taskList":[{"ctDel":0.0,"ctDemand":null,"ctId":2,"ctModify":1.0,"ctNew":2.0,"ctNum":"C0002","ctOtherPath":"D:\\","ctOtherUser":"62,34,48","ctProgramPath":"D:\\","ctSignificance":"1","ctStandartPath":"D:\\","ctState":"转测试评估","ctTime":"2014-06-26 16:55:52","ctTotal":3.0,"version":{"UBoot":"V1.0","VId":1,"baselineversion":"V1.0.0.4","externalversion":"V1.0.1L11","internalversion":"V1.0.0.4L11"}},{"ctDel":0.0,"ctDemand":null,"ctId":1,"ctModify":2.0,"ctNew":2.0,"ctNum":"C0001","ctOtherPath":"D:\\","ctOtherUser":"31,60,27","ctProgramPath":"D:\\","ctSignificance":"1","ctStandartPath":"D:\\","ctState":"转测试评估","ctTime":"2014-06-26 16:47:26","ctTotal":3.0,"version":{"UBoot":"V1.4","VId":9,"baselineversion":"V1.0.1.8","externalversion":"HNYX_DVN_JHB_V1.8","internalversion":"V1.0.1.9"}}]}

解决了一礼拜了，还是没解决，望高手帮忙看看！谢谢

[紫砂壶泡咖啡]

大家都不懂吗

[棉花糖棉花]

你这个好像不是普通的grid而是treeGrid是吧？一般treeGrid是没有store的，而是用TreeLoader加载数据，后台渲染的json数据也不应该包括total之类的属性，而是只需要数据的数组应该就可以了

[紫砂壶泡咖啡]

没人吗？救救我吧

[紫砂壶泡咖啡]

引用 3 楼 xiaoxl0524 的回复:

你这个好像不是普通的grid而是treeGrid是吧？一般treeGrid是没有store的，而是用TreeLoader加载数据，后台渲染的json数据也不应该包括total之类的属性，而是只需要数据的数组应该就可以了

用的就是gridpanel，怎么可能用treegrid去显示表格

[浮生若梦]

你检查下mode和store是否跟后台传过来的数据对得上