Exception in thread "HouseKeeper" java.lang.NullPointerException

http://hi.baidu.com/dannyif/blog/item/66f4cdd749ca3f2806088b5a.html

今天应用启动后,页面点击几下就报出 Exception in thread "HouseKeeper" java.lang.NullPointerException;    多点几次会重复出现这bug, 然后在网上找到一个比较妙的解决办法:

LoadServlet.java :

package com.fsti.ec.common;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.logicalcobwebs.proxool.ProxoolFacade;

public class LoadServlet extends HttpServlet {
public void init() throws ServletException {
}

public void destroy() {
//此处添加处理
ProxoolFacade.shutdown();
}

public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request,response);
}
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {

}

}

package com.fsti.ec.common;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.logicalcobwebs.proxool.ProxoolFacade;

public class LoadServlet extends HttpServlet {
public void init() throws ServletException {
}

public void destroy() {
//此处添加处理
ProxoolFacade.shutdown();
}

public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request,response);
}
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {

}

}

在web.xml 里的配置:

loadServlet com.fsti.ec.common.LoadServlet 1