Java Web应用程序在一段时间后停止工作

Question

When I run my Java Web App, made using Netbeans, it runs perfectly with no problems, and everything seems to work, but if I leave it be, after some idle time, if wanted to do anything with it (mostly loading rows from database, jquery, ajax), nothing happens, when I refresh the page, I get this error.

I'm sorry because I couldn't post the log here, it was too big and my browser crashed every time I pasted, and when it worked Stackoverflow has a limit...so I uploaded it and here's the link.

http://www.crocko.com/99F6AEF8373B425A885BD379686EF2C5/server.log_2012-08-11T05-03-18

StandardWrapperValve[JoinPart]: PWC1406: Servlet.service() for servlet JoinPart threw exception
java.lang.NumberFormatException: null
    at java.lang.Integer.parseInt(Integer.java:454)
    at java.lang.Integer.parseInt(Integer.java:527)
    at JoinPart.doGet(JoinPart.java:315)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:770

EDIT: the current project was a copy of a previous project that contained a servlet JoinPart.java , after creating this copy, I deleted this servlet because I no longer needed it, I don't know if it still exist in some traces of this project, how can I get rid of it? this servlet is already deleted, I checked the javascript files, and none of them contains ajax requests on this servlet, I should have created a whole new project instead of copying, how can I get rid of any traces of this servlet?

Answer 1

Given the symptom and the very little information, I would guess that you are using something from the session. Leaving it for a time you timeout. Since you timed out on your next request you get a new session and it isn't setup the way you expect it to be anymore. You reference something in the session and it's null and you aren't checking for that situation. The stack trace should tell you where you are referencing that something.

Of course, this is just conjecture. When you give more information you will get better answers.

Answer 2

如果您打算从事完全不同的工作，请不要复制项目，请始终创建新项目！