2 Replies Latest reply on Aug 23, 2010 10:48 AM by jess4333

class loader isolation in AS 6.0.0.M4 problem

jess4333 Aug 23, 2010 9:40 AM

I am upgrading from JBoss 4.2.3 to 6.0.0.M4 and I am having issues getting my application to deploy. I currently use Hibernate and Struts in my application and I am getting ClassCastException on the XML parsers that are included in my war file. I have tried to isolate my war file by adding the following to jboss-web.xml:

<class-loading>
    <loader-repository>
      net.idt:loader=IdtWebAppsLoader
      <loader-repository-config>java2ParentDelegation=false</loader-repository-config>
    </loader-repository>
</class-loading>

But I continue to get the folling exception:

09:15:05,761 INFO [STDOUT] Warning: Caught exception attempting to use SAX to load a SAX XMLReader
09:15:05,762 INFO [STDOUT] Warning: Exception was: java.lang.ClassCastException: org.apache.xerces.parsers.SAXParser cannot be cast to org.xml.sax.XMLReader
09:15:05,762 INFO [STDOUT] Warning: I will print the stack trace then carry on using the default SAX parser
09:15:05,762 ERROR [STDERR] java.lang.ClassCastException: org.apache.xerces.parsers.SAXParser cannot be cast to org.xml.sax.XMLReader
09:15:05,764 ERROR [STDERR]     at org.xml.sax.helpers.XMLReaderFactory.loadClass(Unknown Source)
09:15:05,764 ERROR [STDERR]     at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(Unknown Source)
09:15:05,764 ERROR [STDERR]     at org.dom4j.io.SAXHelper.createXMLReader(SAXHelper.java:83)
09:15:05,764 ERROR [STDERR]     at org.dom4j.io.SAXReader.createXMLReader(SAXReader.java:894)
09:15:05,765 ERROR [STDERR]     at org.dom4j.io.SAXReader.getXMLReader(SAXReader.java:715)
09:15:05,765 ERROR [STDERR]     at org.dom4j.io.SAXReader.read(SAXReader.java:435)
09:15:05,765 ERROR [STDERR]     at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1484)
09:15:05,765 ERROR [STDERR]     at org.hibernate.cfg.Configuration.configure(Configuration.java:1428)
09:15:05,766 ERROR [STDERR]     at org.hibernate.cfg.Configuration.configure(Configuration.java:1414)
09:15:05,766 ERROR [STDERR]     at net.idt.base.jutil.HibernateManager.<clinit>(HibernateManager.java:42)
09:15:05,766 ERROR [STDERR]     at java.lang.Class.forName0(Native Method)
09:15:05,766 ERROR [STDERR]     at java.lang.Class.forName(Class.java:186)
09:15:05,767 ERROR [STDERR]     at net.idt.base.jutil.IdtInitServlet.init(IdtInitServlet.java:81)
09:15:05,767 ERROR [STDERR]     at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1208)
09:15:05,767 ERROR [STDERR]     at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1108)
09:15:05,768 ERROR [STDERR]     at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3628)
09:15:05,768 ERROR [STDERR]     at org.apache.catalina.core.StandardContext.start(StandardContext.java:3851)
09:15:05,768 ERROR [STDERR]     at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeployInternal(TomcatDeployment.java:310)
09:15:05,768 ERROR [STDERR]     at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy(TomcatDeployment.java:145)
09:15:05,768 ERROR [STDERR]     at org.jboss.web.deployers.AbstractWarDeployment.start(AbstractWarDeployment.java:461)
09:15:05,769 ERROR [STDERR]     at org.jboss.web.deployers.WebModule.startModule(WebModule.java:116)
09:15:05,769 ERROR [STDERR]     at org.jboss.web.deployers.WebModule.start(WebModule.java:95)
09:15:05,769 ERROR [STDERR]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
09:15:05,769 ERROR [STDERR]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
09:15:05,770 ERROR [STDERR]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

09:15:05,770 ERROR [STDERR]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
09:15:05,770 ERROR [STDERR]     at java.lang.reflect.Method.invoke(Method.java:616)
09:15:05,770 ERROR [STDERR]     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
09:15:05,770 ERROR [STDERR]     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
09:15:05,770 ERROR [STDERR]     at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
09:15:05,771 ERROR [STDERR]     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:271)
09:15:05,771 ERROR [STDERR]     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:670)
09:15:05,771 ERROR [STDERR]     at org.jboss.system.microcontainer.ServiceProxy.invoke(ServiceProxy.java:206)
09:15:05,771 ERROR [STDERR]     at $Proxy41.start(Unknown Source)
09:15:05,772 ERROR [STDERR]     at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:53)
09:15:05,772 ERROR [STDERR]     at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:41)
09:15:05,772 ERROR [STDERR]     at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62)
09:15:05,772 ERROR [STDERR]     at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71)
09:15:05,773 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51)
09:15:05,773 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:379)
09:15:05,773 ERROR [STDERR]     at org.jboss.system.microcontainer.ServiceControllerContext.install(ServiceControllerContext.java:301)
09:15:05,773 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:2044)
09:15:05,773 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:1083)
09:15:05,774 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.executeOrIncrementStateDirectly(AbstractController.java:1322)
09:15:05,774 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1246)
09:15:05,774 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1139)
09:15:05,774 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:939)
09:15:05,775 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:654)
09:15:05,775 ERROR [STDERR]     at org.jboss.system.ServiceController.doChange(ServiceController.java:671)
09:15:05,775 ERROR [STDERR]     at org.jboss.system.ServiceController.start(ServiceController.java:443)
09:15:05,775 ERROR [STDERR]     at org.jboss.system.deployers.ServiceDeployer.start(ServiceDeployer.java:189)
09:15:05,776 ERROR [STDERR]     at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:102)
09:15:05,776 ERROR [STDERR]     at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:49)
09:15:05,776 ERROR [STDERR]     at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.internalDeploy(AbstractSimpleRealDeployer.java:62)
09:15:05,776 ERROR [STDERR]     at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:55)
09:15:05,777 ERROR [STDERR]     at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:179)
09:15:05,777 ERROR [STDERR]     at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1832)
09:15:05,777 ERROR [STDERR]     at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1550)
09:15:05,777 ERROR [STDERR]     at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1571)
09:15:05,778 ERROR [STDERR]     at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1491)
09:15:05,778 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:379)
09:15:05,778 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:2044)
09:15:05,778 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:1083)
09:15:05,779 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.executeOrIncrementStateDirectly(AbstractController.java:1322)
09:15:05,779 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1246)
09:15:05,779 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1139)
09:15:05,779 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:939)

09:15:05,779 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:939)
09:15:05,779 ERROR [STDERR]     at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:654)
09:15:05,780 ERROR [STDERR]     at org.jboss.deployers.plugins.deployers.DeployersImpl.change(DeployersImpl.java:1983)
09:15:05,780 ERROR [STDERR]     at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:1076)
09:15:05,780 ERROR [STDERR]     at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:679)
09:15:05,780 ERROR [STDERR]     at org.jboss.system.server.profileservice.deployers.MainDeployerPlugin.process(MainDeployerPlugin.java:106)
09:15:05,781 ERROR [STDERR]     at org.jboss.profileservice.dependency.ProfileControllerContext$DelegateDeployer.process(ProfileControllerContext.java:130)
09:15:05,781 ERROR [STDERR]     at org.jboss.profileservice.deployment.hotdeploy.HDScanner$HDScanAction.deploy(HDScanner.java:240)
09:15:05,781 ERROR [STDERR]     at org.jboss.profileservice.deployment.hotdeploy.HDScanner$HDScanAction.complete(HDScanner.java:192)
09:15:05,781 ERROR [STDERR]     at org.jboss.profileservice.management.TwoPCActionWrapper.doComplete(TwoPCActionWrapper.java:59)
09:15:05,782 ERROR [STDERR]     at org.jboss.profileservice.management.actions.AbstractTwoPhaseModificationAction.complete(AbstractTwoPhaseModificationAction.java:74)
09:15:05,782 ERROR [STDERR]     at org.jboss.profileservice.management.actions.AbstractTwoPhaseModificationAction.prepare(AbstractTwoPhaseModificationAction.java:94)
09:15:05,782 ERROR [STDERR]     at org.jboss.profileservice.management.ModificationSession.prepare(ModificationSession.java:87)
09:15:05,782 ERROR [STDERR]     at org.jboss.profileservice.management.AbstractActionController.internalPerfom(AbstractActionController.java:234)
09:15:05,783 ERROR [STDERR]     at org.jboss.profileservice.management.AbstractActionController.performWrite(AbstractActionController.java:213)
09:15:05,783 ERROR [STDERR]     at org.jboss.profileservice.management.AbstractActionController.perform(AbstractActionController.java:150)
09:15:05,783 ERROR [STDERR]     at org.jboss.profileservice.management.AbstractActionController.perform(AbstractActionController.java:135)
09:15:05,783 ERROR [STDERR]     at org.jboss.profileservice.deployment.hotdeploy.HDScanner.scan(HDScanner.java:146)
09:15:05,784 ERROR [STDERR]     at org.jboss.profileservice.deployment.hotdeploy.HDScanner.run(HDScanner.java:90)
09:15:05,784 ERROR [STDERR]     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
09:15:05,784 ERROR [STDERR]     at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
09:15:05,784 ERROR [STDERR]     at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
09:15:05,785 ERROR [STDERR]     at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)
09:15:05,785 ERROR [STDERR]     at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
09:15:05,785 ERROR [STDERR]     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
09:15:05,785 ERROR [STDERR]     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
09:15:05,785 ERROR [STDERR]     at java.lang.Thread.run(Thread.java:636)

This particular error is occuring when we try to parse the hibernate.cfg.xml file. Both Hibernate and Struts load xml-apis as transitive dependecies which seems to be conflicting with the JBoss XML parser. If I remove Hibernate from my war then I get a similar error loading Struts. Is there a way to get the class loader isloation to work so I don't have to remove the jar file dependencies from my war file?

Thanks,

Jessica

1. Re: class loader isolation in AS 6.0.0.M4 problem

saltnlight5 Aug 23, 2010 10:40 AM (in response to jess4333)

You can try removing the xerces*.jar from your application.

See similar wiki here http://community.jboss.org/wiki/WhydoigetjavalangClassCastExceptionorgapachexercesparsersXIncludeAwareParserConfigurationinAS-5
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2. Re: class loader isolation in AS 6.0.0.M4 problem

jess4333 Aug 23, 2010 10:48 AM (in response to saltnlight5)

There is no version of xerces is or xercesImpl in my war file. I think the exception is because I have xml-apis in my war which really cannot be removed as it is a transitive dependency of Struts.

I was going to migrate to 5.1 initially but I was having this exact problem in that version also. I found this issue https://jira.jboss.org/browse/JBAS-7210 which seemed to be on point. It says it was fixed in 6.0.0.M2 which is why I jumped right to the newer version.
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