tomcat throwing exceptions
Hi everyone, I'm currently getting a tomcat exception showing up in my logs - I'm not sure if this is a Tomcat problem or not, so any suggestions would be great. (I am using Tomcat 4.1.10, can't use 5 because of what is running in production) The exception is: 2005-03-18 17:15:19 StandardWrapperValve[UserPurchase]: Servlet.service() for servlet zzz threw exception java.lang.NullPointerException at org.apache.coyote.tomcat4.CoyoteResponseFacade.isCommitted(CoyoteRespons eFacade.java:244) at .servlet.HandleRequest.showMessage(HandleRequest.java:203) ... (etc etc etc.) Now the interested thing is that this is happening when I am trying to load-test my app. I have written a small java program to create 10 threads, and for each to make a HttpRequest (all are the same), and to print out the corresponding HTML. (I also wrote it in C# just to make sure that it wasn't the problem) If I fire off a few requests, with a gap (200ms) in between, everyone works fine. But then if I quicken the delays to about 20ms, I start to get these exceptions. It looks like Tomcat is thinking that a request is part of a previous request, and then something goes wrong. Any suggestions would be really helpful, thanks very much guys. LB - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: tomcat throwing exceptions
From: Barclay, Lachlan [mailto:[EMAIL PROTECTED] Subject: tomcat throwing exceptions But then if I quicken the delays to about 20ms, I start to get these exceptions. It looks like Tomcat is thinking that a request is part of a previous request, and then something goes wrong. Odds are it's your application, not Tomcat. (Although this is a pretty old level, and there have been a fair number of bugs fixed since then.) Look for some request- or response-related object being stored in the session or in the servlets being used. Since you can have multiple threads using the session and each servlet simultaneously, you could be inadvertently sharing data. Static fields are also prone to this problem unless carefully used. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: tomcat throwing exceptions
Just out of curiousity what this line means ? StandardWrapperValve[UserPurchase]: Also this line looks strange .servlet.HandleRequest.showMessage(HandleRequest.java:203) On Fri, 18 Mar 2005 00:34:18 -0600, Caldarale, Charles R [EMAIL PROTECTED] wrote: From: Barclay, Lachlan [mailto:[EMAIL PROTECTED] Subject: tomcat throwing exceptions But then if I quicken the delays to about 20ms, I start to get these exceptions. It looks like Tomcat is thinking that a request is part of a previous request, and then something goes wrong. Odds are it's your application, not Tomcat. (Although this is a pretty old level, and there have been a fair number of bugs fixed since then.) Look for some request- or response-related object being stored in the session or in the servlets being used. Since you can have multiple threads using the session and each servlet simultaneously, you could be inadvertently sharing data. Static fields are also prone to this problem unless carefully used. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- rgds Antony Paul http://www.geocities.com/antonypaul24/ - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
