Different jar version
What happens if I put different jar versions of same classes on WEB-INF/lib? Example: project.jar (new version) project_old.jar (old version) Tomcat load and use both? Could Tomcat be confused with this situation? Thanks a lot - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Different jar version
From: Andrew Hole [mailto:[EMAIL PROTECTED] What happens if I put different jar versions of same classes on WEB-INF/lib? Example: project.jar (new version) project_old.jar (old version) Tomcat load and use both? Could Tomcat be confused with this situation? Each time a class is requested, the classloader looks through the jars until it finds a class with that name, then immediately loads the one it finds. There may be other copies in other jars; they are not loaded. To my knowledge*, there's no way of knowing in advance in which order Tomcat will look through the jars. If you have two classes with the same name, you have no way of knowing in advance which one will be loaded. Tomcat won't be confused, but you sure will be if you have different versions of the same classes in different jars :-). - Peter * As always, happy to be corrected by those who know better! - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Different jar version
It uses the first version of the class it finds when findClass is called. First version depends on which jar it looks in first. There is no defined order in which jars should be read first. So the behavior of Tomcat would be like any other java application - unknown. -Tim Andrew Hole wrote: What happens if I put different jar versions of same classes on WEB-INF/lib? Example: project.jar (new version) project_old.jar (old version) Tomcat load and use both? Could Tomcat be confused with this situation? - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Different jar version
The question is better what happen if you have 2 classes with same name and package in the same classloader? Knowing which of both classes will be indeed loaded and used when need is undetermined. Only one of those classes will be used, but it there is no rule as to which will be used. This is mainly depended on the order at which tomcat looks at .jar which itself is dependent on order in which filesystem returns them, which depend on os, date, filename, etc. En l'instant précis du 10/10/07 16:45, Andrew Hole s'exprimait en ces termes: What happens if I put different jar versions of same classes on WEB-INF/lib? Example: project.jar (new version) project_old.jar (old version) Tomcat load and use both? Could Tomcat be confused with this situation? Thanks a lot - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- http://www.devlog.be (a belgian developer's logs) - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Different jar version
From: Andrew Hole [mailto:[EMAIL PROTECTED] Subject: Different jar version What happens if I put different jar versions of same classes on WEB-INF/lib? Really Bad Things. Could Tomcat be confused with this situation? Yes, as is the person who did such a thing. Depending on the order the jars happen to show up in the directory (the real directory, not the sorted one shown by ls or dir commands), one will likely take precedence over the other, but you can't predict which that will be. This is a Very Bad Idea. - 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 start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Different jar version
I'm getting OutofMemoryError ... Could have some relationship having two different versions of jar and memory leak? Thanks On 10/10/07, Caldarale, Charles R [EMAIL PROTECTED] wrote: From: Andrew Hole [mailto:[EMAIL PROTECTED] Subject: Different jar version What happens if I put different jar versions of same classes on WEB-INF/lib? Really Bad Things. Could Tomcat be confused with this situation? Yes, as is the person who did such a thing. Depending on the order the jars happen to show up in the directory (the real directory, not the sorted one shown by ls or dir commands), one will likely take precedence over the other, but you can't predict which that will be. This is a Very Bad Idea. - 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 start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Different jar version
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Andrew, Andrew Hole wrote: I'm getting OutofMemoryError ... Could have some relationship having two different versions of jar and memory leak? It's very unlikely. As other posters have said, either one class gets loaded or the other one does, not both. The effect is as if the other one were not available at all. Therefore, the memory leak is unlikely to be related to the duplicate JARs. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHDPkW9CaO5/Lv0PARAsKuAJoCFDqH+Mwu5FaiQzFrLqNFt0IF6gCgvkZ/ 3WKGOJMEMvQRwooNfteXcM0= =uAoS -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Different jar version
From: Andrew Hole [mailto:[EMAIL PROTECTED] Subject: Re: Different jar version I'm getting OutofMemoryError ... Could have some relationship having two different versions of jar and memory leak? Not likely, but it really depends on how your classes interact. Instead of indulging in rather pointless speculation, why not fix the obvious error by removing the redundant jar and see what happens? - 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 start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
