1. 问题描述:
页面通过异步访问action, action的方法通过map封装数据,struts的result的type设置为json,后台报错
六月 25, 2016 6:54:33 下午 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [default] in context with path [/msf] threw exception [Filter execution threw an exception] with root cause
java.lang.*Error
at sun.reflect.misc.ReflectUtil.checkPackageAccess(ReflectUtil.java:177)
at sun.reflect.misc.ReflectUtil.checkPackageAccess(ReflectUtil.java:164)
at sun.reflect.misc.ReflectUtil.isPackageAccessible(ReflectUtil.java:195)
at java.beans.Introspector.getBeanInfo(Introspector.java:154)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:177)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:160)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:126)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:352)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:215)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:160)
2.action的代码
package com.cdv.mediastar.action; import java.util.HashMap;
import java.util.List;
import java.util.Map; import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession; import org.apache.struts2.ServletActionContext;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller; import com.cdv.mediastar.model.User;
import com.cdv.mediastar.model.UserSessionlog;
import com.cdv.mediastar.service.UserService;
import com.cdv.mediastar.util.PageParameter;
import com.opensymphony.xwork2.ActionSupport;
@Scope("request")
@Controller("logAction")
public class LogAction extends ActionSupport { /**
*
*/
private static final long serialVersionUID = -1455520770797186253L; Map<String, Object> dataMap = new HashMap<String, Object>(); public Map<String, Object> getDataMap() {
return dataMap;
} public void setDataMap(Map<String, Object> dataMap) {
this.dataMap = dataMap;
}
@Resource
private UserService userService; public String index(){
return "index";
} public String list(){
dataMap.clear();
PageParameter page = new PageParameter();
HttpServletRequest request = ServletActionContext.getRequest();
HttpSession session = request.getSession();
User user = (User) session.getAttribute("user");
String userid = user.getUserid();
String appName = "Alkaid";
List<UserSessionlog> sessionlogList = userService.findlog(userid, appName, 0, page.getPageSize());
int totalCount = userService.countlog(userid, appName);
int totalPage = totalCount%page.getPageSize()==0?totalCount/page.getPageSize():totalCount%page.getPageSize()+1;
page.setTotalCount(totalCount);
page.setTotalPage(totalPage);
int startNum = 0, stopNum = 0;
startNum = 1;
if((startNum+page.getPageSize()-1)<=totalCount){
stopNum = startNum+page.getPageSize()-1;
}else{
stopNum = totalCount;
}
dataMap.put("startNum", startNum);
dataMap.put("stopNum", stopNum);
dataMap.put("page", page);
dataMap.put("sessionlogList", sessionlogList);
return "success";
} }
3. 问题排查及解决方案
以上红色部分,向map中添加了两个对象,结果值栈(*)溢出。
去掉一个对象page,改为加入String类型的值,错误解决。