Spring hibernate struts2 jsonPlugin的报错

com.googlecode.jsonplugin.JSONException: com.googlecode.jsonplugin.JSONException: java.lang.reflect.InvocationTargetException
com.googlecode.jsonplugin.JSONWriter.bean(JSONWriter.java:239)
com.googlecode.jsonplugin.JSONWriter.process(JSONWriter.java:161)
com.googlecode.jsonplugin.JSONWriter.value(JSONWriter.java:127)

jquery 使用的是getjson，struts2返回的是list，list数据有外键具体如下：
action（get set 省略）： public String sbSelfList() throws Exception {
Map sess=ActionContext.getContext().getSession();
Integer value=((Qx)sess.get("qx")).getUserid();
String hql="from Sb s where s.yg.ygNum=(select y.ygNum from Yg y where y.qx.userid="+value+")";
this.pageBean = memberService.queryForPage(hql,10, page);
return SUCCESS;
struts。xml：
<action name="sbselflist" class="listaction" method="sbSelfList">
<result name="succe

hibernat，struts和spring In spring,a spring springs into spring spring是什么意思 pierian spring Spring came. spring 问题 spring line Spring Festival in spring in spring 还是in the spring