Exception in thread "HouseKeeper" java.lang.NullPointerException

古城微笑少年丶 2022-08-12 12:59 134阅读 0赞

使用proxool了...版本0.9.1  
  
时不时会报异常如下:

Exception代码   ![收藏代码][icon_star.png]

1.  Exception in thread "HouseKeeper" java.lang.NullPointerException  
2.      at org.logicalcobwebs.proxool.HouseKeeperController.getHouseKeeperToRun(HouseKeeperController.java:53)  
3.      at org.logicalcobwebs.proxool.HouseKeeperThread.run(HouseKeeperThread.java:33)

参考:  
  
[http://yang7527.iteye.com/blog/427512][http_yang7527.iteye.com_blog_427512]  
[http://harbey.iteye.com/blog/888966][http_harbey.iteye.com_blog_888966]  
[http://topic.csdn.net/u/20080708/16/823ff6cc-a062-40e9-9858-169013138487.html][http_topic.csdn.net_u_20080708_16_823ff6cc-a062-40e9-9858-169013138487.html]

引用

This is because Proxool is not being shutdown properly. If the JVM stops then Proxool recognises that and shuts down gracefully, but if you redeploy Proxool into some environments (for example, a servlet container) then Proxool needs to be explicitly told so by calling ProxoolFacade.shutdown(). If you have a servlet container then you could put it in the servlet's destroy() method. Alternatively, use the ServletConfigurator to both configure and shutdown Proxool

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

Java代码   ![收藏代码][icon_star.png]

1.  package com.fsti.ec.common;  
2.    
3.  import java.io.IOException;  
4.    
5.  import javax.servlet.ServletException;  
6.  import javax.servlet.http.HttpServlet;  
7.  import javax.servlet.http.HttpServletRequest;  
8.  import javax.servlet.http.HttpServletResponse;  
9.    
10. import org.logicalcobwebs.proxool.ProxoolFacade;  
11.   
12. public class LoadServlet extends HttpServlet \{  
13. public void init() throws ServletException \{   
14.      \}  
15.   
16.      public void destroy() \{   
17.          //此处添加处理   
18.          ProxoolFacade.shutdown();   
19.      \}  
20.   
21.      public void doPost(HttpServletRequest request, HttpServletResponse response) throws   
22.          ServletException, IOException \{   
23.          doGet(request,response);   
24.      \}   
25.      public void doGet(HttpServletRequest request, HttpServletResponse response) throws   
26.          ServletException, IOException \{   
27.            
28.      \}  
29.   
30. \}

在web.xml 里的配置:

Xml代码   ![收藏代码][icon_star.png]

1.    
2.  <servlet>   
3.      <servlet-name>loadServlet</servlet-name>   
4.      <servlet-class>com.fsti.ec.common.LoadServlet</servlet-class>   
5.      <load-on-startup>1</load-on-startup>   
6.  </servlet>

[icon_star.png]: /images/20220810/d3e2f691035d4b26a2b390dee3fd424b.png
[http_yang7527.iteye.com_blog_427512]: http://yang7527.iteye.com/blog/427512
[http_harbey.iteye.com_blog_888966]: http://harbey.iteye.com/blog/888966
[http_topic.csdn.net_u_20080708_16_823ff6cc-a062-40e9-9858-169013138487.html]: http://topic.csdn.net/u/20080708/16/823ff6cc-a062-40e9-9858-169013138487.html
[http_hi.baidu.com_dannyif_blog_item_66f4cdd749ca3f2806088b5a.html]: http://hi.baidu.com/dannyif/blog/item/66f4cdd749ca3f2806088b5a.html