Hello I have the following requirements regarding class loading in JBoss/Tomcat
Firstly, all the deployment units should be isolated from each other, and have the possibility to override classes of the parent classloader (as described in the "Isolation with Overriding" feature in http://www.jboss.org/wiki/Wiki.jsp?page=ClassLoadingConfiguration)). Secondly, some libraries should be globally accessible. This means they are installed on the machine in one directory and all applications can use them. I constructed the following test application: In my example I would like to have an EAR file which contains two WAR-files. The classes from the WAR-file should be first loaded from the classes directory of the WAR-file then from the lib and last from the parent class loader. For the sake of this example the two war files contain exactly the same servlet which invoke a class that can determine its own codesource. This class is deployed in a jar file the WEB-INF/lib file of each War-file. The jar file is called jpi-jboss-iv-classloadertest.jar. The servlet than just reports a string from where the jar file is loaded. for example [STDOUT] CodeSource = (file:/C:/jboss/4.0/server/test/tmp/deploy/tmp52670my.sar-contents/first.war/WEB-INF/lib/jpi-jboss-iv-classloadertest.jar <no certificates>) This way I can see from which Jar file the class is loaded. My first approach was following the solution described in the WIKI mentioned above. So each WAR-file does contain a jboss-web.xml file which configure a loader-repository in this way jboss-web.xml of first.war | <class-loading java2ClassLoadingCompliance="false"> | <loader-repository> | com.winterthur.jackpot.karin:loader=first.war | <loader-repository-config>java2ParentDelegation=false</loader-repository-config> | </loader-repository> | </class-loading> | jboss-web.xml of second.war | <class-loading java2ClassLoadingCompliance="false"> | <loader-repository> | com.winterthur.jackpot.karin2:loader=second.war | <loader-repository-config>java2ParentDelegation=false</loader-repository-config> | </loader-repository> | </class-loading> | Because I'd like to access those global libraries I build up a SAR-file that contains a jboss-service.xml where I defined a classpath including my global accessible libraries. The SAR-file does contain the EAR-file mentioned above. (which contains the two WAR-files). The jboss-service.xml file looks like this: | <server> | | <classpath | codebase="file:/C:/common/lib/" | archives="mycommon.jar"/> | </server> | The flag "UseJBossWebLoader" and the flag "Java2ClassLoadingCompliance" in the file jboss-service.xml of Tomcat are set to true. To test the isolation between the JBoss and th application I also deployed the jpi-jboss-iv-classloadertest.jar to the server/lib directory of Jboss. The effect of this configuration was that the class was not loaded from the War file but from the server/lib directory of JBoss. In my next trial I set the flag "Java2ClassLoadingCompliance" in the file jboss-service.xml of Tomcat to false, but this has the same effect. Now I defined the loader-repository in the jboss-service.xml file, then the class was loaded from always the same WAR-file (this was what I expected, but not the effect I wish to have, because I'd like to isolate the different WAR-files from each other). At the end I came up with a configuration that seems to work fine, but as it does not correspond to the recommendation in the WIKI, I would ask you to review this. Possibly there is another better solution, than this. Ok, here is the configuration: I did not define any loader repositories (not in the jboss-service.xml file and not in the jboss-web.xml file), but I set the flag "UseJBossWebLoader" and the flag "Java2ClassLoadingCompliance" in the file jboss-service.xml of Tomcat are set to false. This way the jpi-jboss-iv-classloadertest.jar is loaded from the WAR file in use (so separation of the WARs from each other is reached), also the mycommon.jar was found. Regards Karin P.S.: I use JBoss 4.0.1 (build: CVSTag=JBoss_4_0_1 date=200412230944 View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3862543#3862543 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3862543 ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
