请高手帮助解决datagrid出错的问题
t:datagrid已有的查询功能无法满足需求，我另加一按钮，调用后台classify_datagrid()，总是出错，请高人帮忙。代码：
public void classify_datagrid(UYearScoreEntity uYearScore,HttpServletRequest request, HttpServletResponse response, DataGrid dataGrid,String classify) {
classify = classify==null?"":classify;
System.out.println("aaaaa="+classify);
CriteriaQuery cq = new CriteriaQuery(UYearScoreEntity.class, dataGrid);
//查询条件组装器
org.jeecgframework.core.extend.hqlsearch.HqlGenerateUtil.installHql(cq, uYearScore, request.getParameterMap());
try{
}catch (Exception e) {
throw new BusinessException(e.getMessage());
}
cq.add();
this.uYearScoreService.getDataGridReturn(cq, true);
TagUtil.datagrid(response, dataGrid);
}
在TagUtil.datagrid(response, dataGrid);这一行出java.lang.NullPointerException错误。
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