jquery-easyui的treegrid无法得到后台数据
$('#tg').treegrid({
title:'角色列表',
iconCls: 'icon-edit',
rownumbers: true,
animate: true,
collapsible: true,
fitColumns: true,
url: 'roleList.action',
idField: 'id',
treeField: 'name',
pagination:true,
showFooter: false,
columns:[[
{title:'角色名称',field:'name',width:100},
{field:'des',title:'描述',width:100,align:'right'},
{field:'modify',title:'修改时间',width:100},
{field:'operate',title:'操作',width:100,align:'center',formatter:formatOperate}
]]
});

后台JSONArray ja = JSONArray.fromObject(roleList);
JSONObject jo=new JSONObject();

jo.put("total", roleList.size());

jo.put("rows", ja);
System.out.println(jo.toString());
PrintWriter out = response.getWriter();
out.print(jo.toString());
out.flush();
out.close();
把json数据写到流里面，浏览器中能得到数据，但是从前台部能跳转到ACTION里面，请高手指点
[解决办法]
pagination:true,去掉