How to separate ear classloader and system classloader in JBoss 6?

问题

I'm trying to upgrade from JBoss 4.2.1 to JBoss 6. In JBoss 4.2.1, we are manually deploying our application as an exploded war and everything works beautifully.

I'm running into problems because the application that I am trying to deploy uses versions of 3rd party libraries that are older than the ones that JBoss 6 now includes by default. The result of this is that I'm getting classloader conflicts all over the place and the application won't even start.

At present, I have tried using the JBoss Classloading Documentation as well as the scanty bits of documentation for jboss-classloading.xml and haven't had any success.

Has anyone out there managed to do this successfully? If you have, how did you do it?

I've included a stack trace below in case it offers any useful information.

Caused by: java.lang.Error: Error visiting "/C:/jboss6/server/default/deploy/app.war/WEB-INF/lib/jaxb-xjc-2.1.12.jar/1.0/com/sun/codemodel/JConditional.class"
    at org.jboss.classloading.plugins.vfs.VFSResourceVisitor.visit(VFSResourceVisitor.java:268) [jboss-classloading-vfs.jar:2.2.0.Alpha9]
    at org.jboss.vfs.VirtualFile.visit(VirtualFile.java:407) [jboss-vfs.jar:3.0.0.CR5]
    at org.jboss.vfs.VirtualFile.visit(VirtualFile.java:409) [jboss-vfs.jar:3.0.0.CR5]
    at org.jboss.vfs.VirtualFile.visit(VirtualFile.java:409) [jboss-vfs.jar:3.0.0.CR5]
    at org.jboss.vfs.VirtualFile.visit(VirtualFile.java:409) [jboss-vfs.jar:3.0.0.CR5]
    at org.jboss.vfs.VirtualFile.visit(VirtualFile.java:409) [jboss-vfs.jar:3.0.0.CR5]
    at org.jboss.vfs.VirtualFile.visit(VirtualFile.java:395) [jboss-vfs.jar:3.0.0.CR5]
    at org.jboss.classloading.plugins.vfs.VFSResourceVisitor.visit(VFSResourceVisitor.java:102) [jboss-classloading-vfs.jar:2.2.0.Alpha9]
    at org.jboss.deployers.vfs.plugins.classloader.VFSDeploymentClassLoaderPolicyModule.visit(VFSDeploymentClassLoaderPolicyModule.java:181) [:2.2.0.Alpha8]
    at org.jboss.scanning.plugins.DeploymentUnitScanner.scan(DeploymentUnitScanner.java:111) [:1.0.0.Alpha7]
    at org.jboss.scanning.spi.helpers.UrlScanner.scan(UrlScanner.java:96) [:1.0.0.Alpha7]
    at org.jboss.scanning.deployers.ScanningDeployer.deploy(ScanningDeployer.java:90) [:1.0.0.Alpha7]
    at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:179) [:2.2.0.Alpha8]
    ... 41 more

回答1:

Have you tried "java2ParentDelegation=false"? Also you might find the below two useful

jboss classloading usecases
jee-j2ee-classloading-standard

Some links on fixing JAXB and JBOSS issues

http://kishantha.blogspot.com/2010/03/fixing-jaxb-linkageerror-in-jboss-with.html
https://issues.jboss.org/browse/JBWS-1931
http://community.jboss.org/wiki/LinkageErrorWithJBoss5Java6
http://community.jboss.org/message/568820

回答2:

We use the following in ear-deployer-jboss-beans.xml

<bean name="EARClassLoaderDeployer" class="org.jboss.deployment.EarClassLoaderDeployer">    
  <property name="isolated">true</property>
</bean>

来源：https://stackoverflow.com/questions/4410017/how-to-separate-ear-classloader-and-system-classloader-in-jboss-6

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Spring

jboss

jaxb

classloader