Struts2 java. lang. StackOverflowError org. apache. struts2.json. JSONWriter, struts2printwriter

Struts2 java. lang. StackOverflowError org. apache. struts2.json. JSONWriter, struts2printwriter

1. Problem description:

The page accesses action asynchronously. The action method encapsulates data through map. The struts result type is set to json, and an error is reported in the background.

June 25 6:54:33 org. apache. catalina. core. standardWrapperValve invokeSEVERE: Servlet. service () for servlet [default] in context with path [/msf] threw exception [Filter execution threw an exception] with root causejava. lang. stackOverflowError 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 Code

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. troubleshooting and Solutions

The red part above adds two objects to the map, and the result value stack (StackOverflow) overflows.

Remove an object page and add a value of the String type. The error is fixed.