Re: Placing JARs in ..../tomcat/shared/lib causes leaks when stopping apps?
On 11/17/2010 02:43 AM, Mikolaj Rydzewski wrote: On Tue, 16 Nov 2010 22:55:10 -0500, Brian bbprefix-m...@yahoo.com wrote: I have two identical apps running at the same time. I mean, they use exactly the same WAR, but each one runs in a different web domain. [...] You should rather change your application to be aware of domain it runs in. Done that, there would be only one webapp deployed - no matter how many domains you need to handle. Perhaps you could give Brian a hint on how to do this. Would using aliases within the host do the trick? mas - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Placing JARs in ..../tomcat/shared/lib causes leaks when stopping apps?
Hi Mikolaj and Mark, Thanks for your help. I do know about aliases, but for some reason a couple of years ago I decided to keep each domain in a different context. And that reason was.hummm..like.. you know what? Either I forgot what the reason was (maybe because I have barely slept last night cause my website crashed), or there was no valid reason! As soon as I finish moving my JARs from the shared directory to the web-inf/lib directory and everything is OK, I will review that. Certaintly, if I don’t remember any valid reason to keep two contexts, I will start using just one! -Original Message- From: Mark Shifman [mailto:mark.shif...@yale.edu] Sent: Wednesday, November 17, 2010 08:30 AM To: Tomcat Users List Subject: Re: Placing JARs in /tomcat/shared/lib causes leaks when stopping apps? On 11/17/2010 02:43 AM, Mikolaj Rydzewski wrote: On Tue, 16 Nov 2010 22:55:10 -0500, Brian bbprefix-m...@yahoo.com wrote: I have two identical apps running at the same time. I mean, they use exactly the same WAR, but each one runs in a different web domain. [...] You should rather change your application to be aware of domain it runs in. Done that, there would be only one webapp deployed - no matter how many domains you need to handle. Perhaps you could give Brian a hint on how to do this. Would using aliases within the host do the trick? mas - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Placing JARs in ..../tomcat/shared/lib causes leaks when stopping apps?
From: Brian [mailto:bbprefix-m...@yahoo.com] Subject: RE: Placing JARs in /tomcat/shared/lib causes leaks when stopping apps? if I don’t remember any valid reason to keep two contexts, I will start using just one! One strong reason to not merge the contexts is to preclude any chance of mingling data between the two. Don't know what your client requirements or expectations are, so that may or may not be a concern. - 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.
Placing JARs in ..../tomcat/shared/lib causes leaks when stopping apps?
Hi, I'm using Tomcat 6.0.29. I have two identical apps running at the same time. I mean, they use exactly the same WAR, but each one runs in a different web domain. When I stop/redeploy one of the apps, very often I get the famous leak problem, because of the webclassloader not being able to get collected by the garbage collector. etc etc etc. I'm placing all my library JARs in a common directory (../tomcat/shared/lib), and I set the catalina.properties file so Catalina knows this directory exists. Why did I do that? For two reasons: 1- uploading a WAR without all the support JARs is faster than with them, and I'm uploading my WARs very often, because I'm changing my app constantly. 2- I THOUGHT/THINK that placing the JARs in the same shared directory is better, because it takes less memory, and because after all there must be a reason why the shared directory option existed by default (at least until Tomcat 6.0.14 came out). And given that my two apps use exactly the same WAR, it made sense to me to place the JARs in the shared dir. Now I have read that this issue may be the reason of my problem with leaks. Something like this for each app, the webapploader pretendes to unload all the classes, and if they are shared it is not possible and then the leak happens. Is that true? Should I avoid using the shared lib directory? If so, for what was this option created for? Thanks, Brian
RE: Placing JARs in ..../tomcat/shared/lib causes leaks when stopping apps?
From: Brian [mailto:bbprefix-m...@yahoo.com] Subject: Placing JARs in /tomcat/shared/lib causes leaks when stopping apps? Something like this for each app, the webapploader pretendes to unload all the classes, and if they are shared it is not possible and then the leak happens. Well, the wording of the above is rather odd; there's no pretending going on, and nothing can unload a class directly - that's done only by GC after the class becomes unused. Is that true? Sort of. Should I avoid using the shared lib directory? In almost all cases, yes. It's safe to use the shared library when the classes placed therein truly are library functions (no persistent objects, no keeping of references to their callers), or when an object *must* be shared across multiple webapps. If so, for what was this option created for? To allow /objects/ to be shared across webapps, in the rare instance that it's necessary. Webapps are intended to be independent of one another, and any mingling of their content limits that independence severely - as you are observing. Keep the webapps separate; it's a lot easier on everyone concerned. - 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: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Placing JARs in ..../tomcat/shared/lib causes leaks when stopping apps?
Thanks chuck, now I understand it. My JARs are the regular type of JAR, that doesn't have to be shared by all the apps for some reason. I didn't understand the real pourpose of that directory indeed. I will change it now. -Original Message- From: Caldarale, Charles R [mailto:chuck.caldar...@unisys.com] Sent: Tuesday, November 16, 2010 11:06 PM To: Tomcat Users List Subject: RE: Placing JARs in /tomcat/shared/lib causes leaks when stopping apps? From: Brian [mailto:bbprefix-m...@yahoo.com] Subject: Placing JARs in /tomcat/shared/lib causes leaks when stopping apps? Something like this for each app, the webapploader pretendes to unload all the classes, and if they are shared it is not possible and then the leak happens. Well, the wording of the above is rather odd; there's no pretending going on, and nothing can unload a class directly - that's done only by GC after the class becomes unused. Is that true? Sort of. Should I avoid using the shared lib directory? In almost all cases, yes. It's safe to use the shared library when the classes placed therein truly are library functions (no persistent objects, no keeping of references to their callers), or when an object *must* be shared across multiple webapps. If so, for what was this option created for? To allow /objects/ to be shared across webapps, in the rare instance that it's necessary. Webapps are intended to be independent of one another, and any mingling of their content limits that independence severely - as you are observing. Keep the webapps separate; it's a lot easier on everyone concerned. - 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: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Placing JARs in ..../tomcat/shared/lib causes leaks when stopping apps?
On Tue, 16 Nov 2010 22:55:10 -0500, Brian bbprefix-m...@yahoo.com wrote: I have two identical apps running at the same time. I mean, they use exactly the same WAR, but each one runs in a different web domain. [...] You should rather change your application to be aware of domain it runs in. Done that, there would be only one webapp deployed - no matter how many domains you need to handle. -- Mikolaj Rydzewski m...@ceti.pl - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
