net.sf.json.JSONException: java.lang.reflect.InvocationTargetException

json-lib对象转化为json数据抛net.sf.json.JSONException: va.lang.reflect.InvocationTargetException异常

 

出现了两种情况：

1. 日期格式
2. hibernate延时加载

解决:日期格式

 

private java.util.Date createTime;

 只在字段前声明Date的数据类型可能也会抛异常，在Set,get方法中，有出现Date类型的都把包名加上

 

解决:hibernate延时加载 设置

JsonConfig cfg = new JsonConfig();

cfg.setExcludes(new String[]{"handler","hibernateLazyInitializer"});

 

方法举例

                /**
	 * datagrid easyui 查找出联系人pager-公共的，和自已创建的可以查看
	 */
	@Transactional(readOnly = true)
	public JSONArray datagrid(Pager<AddressBook> page,User user,DetachedCriteria detachedCriteria){
		//有级联，不能直接转化，要取出List放到map里面
		JsonConfig cfg = new JsonConfig();
		//过滤关联，避免死循环net.sf.json.JSONException: java.lang.reflect.InvocationTargetException
	    cfg.setJsonPropertyFilter(new PropertyFilter()
	    {
	         public boolean apply(Object source, String name, Object value) {
	           if(name.equals("addressGroup")||name.equals("user")||name.equals("createTime")||name.equals("birthday")) {
	             return true;
	           } else {
	             return false;
	          }
	        }
	       });
	    //net.sf.json.JSONException: java.lang.reflect.InvocationTargetException异常
	   cfg.setExcludes(new String[]{"handler","hibernateLazyInitializer"});
	    //javabean里出现循环调用啦，赶快用excludes干掉parent或者children 
	   // cfg.setExcludes(new String[]{"addressGroup"}); 
	    //net.sf.json.JSONException: java.lang.reflect.InvocationTargetException日期格式转化出错
	   // cfg.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);   
	    //cfg.registerJsonValueProcessor(Date.class, new DateJsonValueProcessor("yyyy-MM-dd hh:mm:ss"));
	    
		Pager<AddressBook> pager=this.findAllByApprove(page, user, detachedCriteria);
		long total=pager.getTotalCount();
		List<AddressBook> list=pager.getResult();
		Map<String,Object> result=new HashMap<String,Object>();
		result.put("total", total);
		result.put("rows", list);
		JSONArray jsonArray  = JSONArray.fromObject(result,cfg);   
		return jsonArray;
		
		
	}