Re: Tomcat and ClassLoaders
But for me the issue is different for me. I have some applications in ROOT folder after some time (2 to 3 hours) apparently the class is getting loaded from other jars (having the same class) are getting loaded from other webapps directory. I guess it's related to class caching done at the class loader level. -Dorg.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES=false. -Xonclassgc both seems to work fine. But not sure about the implications. Auke Noppe wrote: Hi, I have an application that uses the embedded version of tomcat. In my classpath I have some jars that are the same as the webapp I deploy in tomcat. Now the problem is, that the webapp uses the jars from the classpath of the ‘root’ application and not the jars that the webapp has in his classpath(e.g. libs dir). How can I prevent the webapplication from using the jars from the ‘root’ application? I tried to start the program and tomcat with different classloaders, but nothing changed. Regards, Auke No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.16.9/1155 - Release Date: 27-11-2007 20:30 -- View this message in context: http://www.nabble.com/Tomcat-and-ClassLoaders-tp13990806p19044611.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Tomcat 6.0 Classloaders
Hi, I was wondering whether Tomcat 6.0 still has a classloader for classes that should be globally visible to all webapps only? I read through the classloader documentation and it seems to be saying that $CATALINA_HOME/lib contains classes that are visible to both Tomcat and the webapps. However this resource: http://helpme.morphexchange.com/tomcat6/help/items/chapter_4_2_shared_lib Is saying that shared/lib contains the classes visible to all webapps... Thoughts? Thanks, - Ole - 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: Tomcat 6.0 Classloaders
From: Ole Ersoy [mailto:[EMAIL PROTECTED] Subject: Tomcat 6.0 Classloaders I was wondering whether Tomcat 6.0 still has a classloader for classes that should be globally visible to all webapps only? Not by default. However, you can edit conf/catalina.properties to create any classloader hierarchy you want. I read through the classloader documentation and it seems to be saying that $CATALINA_HOME/lib contains classes that are visible to both Tomcat and the webapps. That is correct. However this resource: http://helpme.morphexchange.com/tomcat6/help/items/chapter_4_2_shared_lib Is saying that shared/lib contains the classes visible to all webapps... Another example of Sturgeon's Law. - 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: Tomcat 6.0 Classloaders
I was wondering whether Tomcat 6.0 still has a classloader
for classes that should be globally visible to all webapps
only?
Not by default. However, you can edit conf/catalina.properties to create any
classloader hierarchy you want.
So I take it:
common.loader = Tomcat's classes/jars visible to both webapps and to itself.
server.loader = only tomcat
shared.loader = only webapps
So if I wanted hibernate-3.0.14.jar to be visible to all webapps I could stick
in in CATALINA_HOME/shared/lib and set shared.loader =
${catalina.home}/shared/lib/hibernate-3.0.14.jar and now it's visible to all
webapps, but not to Tomcat?
Thanks!
- Ole
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RE: Tomcat 6.0 Classloaders
From: Ole Ersoy [mailto:[EMAIL PROTECTED]
Subject: Re: Tomcat 6.0 Classloaders
common.loader = Tomcat's classes/jars visible to both webapps
and to itself.
server.loader = only tomcat
shared.loader = only webapps
Correct. This is how levels prior to 6.0 worked.
So if I wanted hibernate-3.0.14.jar to be visible to all
webapps I could stick in in CATALINA_HOME/shared/lib and set
shared.loader =
${catalina.home}/shared/lib/hibernate-3.0.14.jar and now it's
visible to all webapps, but not to Tomcat?
Also correct, but I don't know why you'd go to that trouble. Adding
classloaders does not improve performance, nor does preventing the Tomcat
kernel from seeing certain jars buy you anything.
- Chuck
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Re: Tomcat 6.0 Classloaders
So if I wanted hibernate-3.0.14.jar to be visible to all
webapps I could stick in in CATALINA_HOME/shared/lib and set
shared.loader =
${catalina.home}/shared/lib/hibernate-3.0.14.jar and now it's
visible to all webapps, but not to Tomcat?
Also correct, but I don't know why you'd go to that trouble. Adding
classloaders does not improve performance, nor does preventing the Tomcat
kernel from seeing certain jars buy you anything.
I've been sitting here trying to come up with some hypothetical reasons that
might make sense, but after writing them out, they all seem pointless, so good
point! At least I know what's in catalina.properties now :-).
Actually one case I think is somewhat valid from an administration point of view is if you are RedBoss and you want to say to users Place all shared/provided webapp libraries in /var/lib/tomcat and have the corresponding Tomcat package pre-configured for this.
Thanks again,
- Ole
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Tomcat and ClassLoaders
Hi, I have an application that uses the embedded version of tomcat. In my classpath I have some jars that are the same as the webapp I deploy in tomcat. Now the problem is, that the webapp uses the jars from the classpath of the ‘root’ application and not the jars that the webapp has in his classpath(e.g. libs dir). How can I prevent the webapplication from using the jars from the ‘root’ application? I tried to start the program and tomcat with different classloaders, but nothing changed. Regards, Auke No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.16.9/1155 - Release Date: 27-11-2007 20:30
