Develop Reference

Tomcat server won't start in Eclipse when running java class. Caused by: java.lang.NoClassDefFoundError: org/json/JSONException

When trying to run my java class in Eclipse, the Tomcat server won't start. There are several errors about java.lang.NoClassDefFoundError: org/json/JSONException and java.lang.ClassNotFoundException: org.json.JSONException. I have imported org.json.JSONException in my project, and have added org.json.jar in my project build path, as an external jar. Org.json.jar is also included in my CLASSPATH environment variable. Any advice is greatly appreciated.
The console error in Eclipse when attempting to start the server states:
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/URL6]]
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:931)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/URL6]]
at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
... 6 more
Caused by: java.lang.NoClassDefFoundError: org/json/JSONException
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredFields(Unknown Source)
at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)
at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:269)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:137)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:69)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:779)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5063)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
... 6 more
Caused by: java.lang.ClassNotFoundException: org.json.JSONException
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1358)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
... 19 more
Project Build Configuration
CLASSPATH

Open the project's Deployment Assembly property page and make sure the jar is set to be deployed as part of the app. The CLASSPATH environment variable doesn't affect Tomcat, and you should stop relying on it in general.

for me, what worked was this...
in the servlet program, I omitted the forward slash "/" in the annotation declaration
#WebServlet("/MyServlet") //correct✔️
public class MyServlet extends HttpServlet{
.
.
.}
#WebServlet("MyServlet") //wrong❌
public class MyServlet extends HttpServlet{
.
.
.}

Failed to start service jboss.undertow.deployment.default-server.default-host. But class is available

I am getting below exception when deploying my war in jboss server. But I have "InitServlet" class in my jar. Could you please tell me how to debug further.
ERROR [org.jboss.msc.service.fail] (MSC service thread 1-6) MSC000001: Failed to start service jboss.undertow.deployment.default-server.default-host."/sample-0.0.1-SNAPSHOT".UndertowDeploymentInfoService: org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host."/sample-0.0.1-SNAPSHOT".UndertowDeploymentInfoService: java.lang.ClassNotFoundException: com.bootstrap.InitServlet from [Module "deployment.sample-0.0.1-SNAPSHOT.war:main" from Service Module Loader]
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.createServletConfig(UndertowDeploymentInfoService.java:1072)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.start(UndertowDeploymentInfoService.java:283)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: com.bootstrap.InitServlet from [Module "deployment.sample-0.0.1-SNAPSHOT.war:main" from Service Module Loader]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:198)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:363)
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:351)
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:93)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.createServletConfig(UndertowDeploymentInfoService.java:727)

JBoss-7 deployment failed

I am trying to deploy a .war file on Jboss-7.1.1 and getting the following error in stacktrace. I have searched about it on web but not sure the cause of this exception
23:01:20,483 WARN [org.jboss.as.server.deployment] (MSC service thread 1-6) Class Path entry p6psy.jar in "/D:/development_environment/servers/Final_jboss/jboss-as-7.1.0.Final/standalone/deployments/SSOAdminTool.war/WEB-INF/lib/xapool.jar" does not point to a valid jar for a Class-Path reference.
23:01:20,800 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-6) MSC00001: Failed to start service jboss.deployment.unit."SSOAdminTool.war".POST_MODULE: org.jboss.msc.service.StartException in service jboss.deployment.unit."SSOAdminTool.war".POST_MODULE: Failed to process phase POST_MODULE of deployment "SSOAdminTool.war"
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:119) [jboss-as-server-7.1.0.Final.jar:7.1.0.Final]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_18]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_18]
at java.lang.Thread.run(Thread.java:619) [rt.jar:1.6.0_18]
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: JBAS011093: Could not load component class org.displaytag.filter.ResponseOverrideFilter
at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.processComponentConfig(InterceptorAnnotationProcessor.java:113)
at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.deploy(InterceptorAnnotationProcessor.java:54)
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:113) [jboss-as-server-7.1.0.Final.jar:7.1.0.Final]
... 5 more
Caused by: java.lang.ClassNotFoundException: org.displaytag.filter.ResponseOverrideFilter from [Module "deployment.SSOAdminTool.war:main" from Service Module Loader]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190) [jboss-modules.jar:1.1.1.GA]
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468) [jboss-modules.jar:1.1.1.GA]
at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456) [jboss-modules.jar:1.1.1.GA]
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398) [jboss-modules.jar:1.1.1.GA]
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120) [jboss-modules.jar:1.1.1.GA]
at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.processComponentConfig(InterceptorAnnotationProcessor.java:111)
... 7 more

Jboss 7.1.1: NamingException class can't be found

This RESTservice project is deployed on a Jboss 7.1.1 with Liferay SDK 6.2.
'javax.api' has already been added as dependency to the jboss-deployment-structure.xml, but this error appears anyway:
09:11:28,741 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-7) MSC00001: Failed to start service jboss.deployment.unit."RESTtest.war".POST_MODULE: org.jboss.msc.service.StartException in service jboss.deployment.unit."RESTtest.war".POST_MODULE: Failed to process phase POST_MODULE of deployment "RESTtest.war"
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:119) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [rt.jar:1.7.0_51]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [rt.jar:1.7.0_51]
at java.lang.Thread.run(Unknown Source) [rt.jar:1.7.0_51]
Caused by: java.lang.RuntimeException: Error getting reflective information for class de.foo.soa.myfoo.sales.MyfooSalesSF with ClassLoader ModuleClassLoader for Module "de.foo.soa.myfoo.modules:main" from local module loader #41c61c91 (roots: C:\fooTest\liferay-portal-JBOSS6.2-ce-ga2\jboss-7.1.1\modules)
at org.jboss.as.server.deployment.reflect.DeploymentReflectionIndex.getClassIndex(DeploymentReflectionIndex.java:70) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
at org.jboss.as.ee.metadata.MethodAnnotationAggregator.runtimeAnnotationInformation(MethodAnnotationAggregator.java:58)
at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.handleAnnotations(InterceptorAnnotationProcessor.java:85)
at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.processComponentConfig(InterceptorAnnotationProcessor.java:70)
at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.deploy(InterceptorAnnotationProcessor.java:55)
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:113) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
... 5 more
Caused by: java.lang.NoClassDefFoundError: javax/naming/NamingException
at java.lang.Class.getDeclaredFields0(Native Method) [rt.jar:1.7.0_51]
at java.lang.Class.privateGetDeclaredFields(Unknown Source) [rt.jar:1.7.0_51]
at java.lang.Class.getDeclaredFields(Unknown Source) [rt.jar:1.7.0_51]
at org.jboss.as.server.deployment.reflect.ClassReflectionIndex.<init>(ClassReflectionIndex.java:57) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
at org.jboss.as.server.deployment.reflect.DeploymentReflectionIndex.getClassIndex(DeploymentReflectionIndex.java:66) [jboss-as-server-7.1.1.Final.jar:7.1.1.Final]
... 10 more
Caused by: java.lang.ClassNotFoundException: javax.naming.NamingException from [Module "de.foo.soa.myfoo.modules:main" from local module loader #41c61c91 (roots: C:\fooTest\liferay-portal-JBOSS6.2-ce-ga2\jboss-7.1.1\modules)]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190) [jboss-modules.jar:1.1.1.GA]
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468) [jboss-modules.jar:1.1.1.GA]
at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456) [jboss-modules.jar:1.1.1.GA]
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398) [jboss-modules.jar:1.1.1.GA]
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120) [jboss-modules.jar:1.1.1.GA]
... 15 more
09:11:28,748 INFO [org.jboss.as.server] (DeploymentScanner-threads - 1) JBAS015870: Deploy of deployment "RESTtest.war" was rolled back with failure message {"JBAS014671: Failed services" => {"jboss.deployment.unit.\"RESTtest.war\".POST_MODULE" => "org.jboss.msc.service.StartException in service jboss.deployment.unit.\"RESTtest.war\".POST_MODULE: Failed to process phase POST_MODULE of deployment \"RESTtest.war\""}}
09:11:28,757 INFO [org.jboss.as.server.deployment] (MSC service thread 1-1) JBAS015877: Stopped deployment RESTtest.war in 9ms
09:11:28,758 INFO [org.jboss.as.controller] (DeploymentScanner-threads - 1) JBAS014774: Service status report
JBAS014777: Services which failed to start: service jboss.deployment.unit."RESTtest.war".POST_MODULE: org.jboss.msc.service.StartException in service jboss.deployment.unit."RESTtest.war".POST_MODULE: Failed to process phase POST_MODULE of deployment "RESTtest.war"
A look in the module.xml of javax/api shows that javax/naming/NamingException is added as dependency, so everything should be fine:
<dependencies>
<system export="true">
<paths>
...
<path name="javax/naming"/>
<path name="javax/naming/directory"/>
<path name="javax/naming/event"/>
<path name="javax/naming/ldap"/>
<path name="javax/naming/spi"/>
...
</paths>
</system>
</dependencies>
I look forward to any constructive suggestion.

It seems you have added the javax api dependency to the jboss-deployment-structure.xml of your deployment, but if you look at your exception message:
ClassNotFoundException: javax.naming.NamingException from
[Module "de.foo.soa.myfoo.modules:main"
it is missing from "de.foo.soa.myfoo.modules" module, not from your deployment. The modules module.xml file is where you need to add the dependency.

ClassCastException when using DeltaSpike Security?

I've written a simple web app to play around with Apache Deltaspike 0.5, but am running into a problem. The app is a simple JavaEE 6 app, deployed as part of an EAR on JBoss EAP 6.1. I've declared the Apache Deltaspike Security module interceptor in my beans.xml file, but when I deploy my app I see the following exception:
[0m[0m12:41:52,798 INFO [org.apache.deltaspike.core.util.ClassDeactivationUtils] (MSC service thread 1-2) class: org.apache.deltaspike.jsf.impl.config.view.ViewConfigExtension activated=true
[0m[31m12:41:52,806 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC000001: Failed to start service jboss.deployment.unit."MyTestApp.ear".WeldStartService: org.jboss.msc.service.StartException in service jboss.deployment.unit."MyTestApp.ear".WeldStartService: Failed to start service
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1767) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [rt.jar:1.7.0_07]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [rt.jar:1.7.0_07]
at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_07]
Caused by: org.jboss.weld.exceptions.DefinitionException: Exception List with 1 exceptions:
Exception 0 :
javax.enterprise.event.ObserverException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at org.jboss.weld.util.reflection.SecureReflections$16.work(SecureReflections.java:344)
at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52)
at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInstantiation(SecureReflectionAccess.java:173)
at org.jboss.weld.util.reflection.SecureReflections.newInstance(SecureReflections.java:341)
at org.jboss.weld.injection.Exceptions.rethrowException(Exceptions.java:33)
at org.jboss.weld.injection.Exceptions.rethrowException(Exceptions.java:73)
at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:162)
at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:245)
at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:233)
at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:213)
at org.jboss.weld.bootstrap.events.AbstractContainerEvent.fire(AbstractContainerEvent.java:75)
at org.jboss.weld.bootstrap.events.AbstractDefinitionContainerEvent.fire(AbstractDefinitionContainerEvent.java:46)
at org.jboss.weld.bootstrap.events.BeforeBeanDiscoveryImpl.fire(BeforeBeanDiscoveryImpl.java:46)
at org.jboss.weld.bootstrap.WeldBootstrap.startInitialization(WeldBootstrap.java:335)
at org.jboss.as.weld.WeldStartService.start(WeldStartService.java:62)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.util.ServiceConfigurationError: org.apache.deltaspike.core.spi.config.ConfigSourceProvider: Provider org.apache.deltaspike.core.impl.config.DefaultConfigSourceProvider could not be instantiated: java.lang.ClassCastException: Cannot cast org.apache.deltaspike.core.impl.config.DefaultConfigSourceProvider to org.apache.deltaspike.core.spi.config.ConfigSourceProvider
at java.util.ServiceLoader.fail(ServiceLoader.java:224)
at java.util.ServiceLoader.access$100(ServiceLoader.java:181)
at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:370)
at java.util.ServiceLoader$1.next(ServiceLoader.java:438)
at org.apache.deltaspike.core.util.ServiceUtils.loadServiceImplementations(ServiceUtils.java:53)
at org.apache.deltaspike.core.api.config.ConfigResolver.resolveConfigSources(ConfigResolver.java:374)
at org.apache.deltaspike.core.api.config.ConfigResolver.getConfigSources(ConfigResolver.java:353)
at org.apache.deltaspike.core.api.config.ConfigResolver.getAllPropertyValues(ConfigResolver.java:306)
at org.apache.deltaspike.core.util.ClassDeactivationUtils.initConfiguredClassDeactivators(ClassDeactivationUtils.java:152)
at org.apache.deltaspike.core.util.ClassDeactivationUtils.getClassDeactivators(ClassDeactivationUtils.java:143)
at org.apache.deltaspike.core.util.ClassDeactivationUtils.initDeactivatableCacheFor(ClassDeactivationUtils.java:88)
at org.apache.deltaspike.core.util.ClassDeactivationUtils.isActivated(ClassDeactivationUtils.java:73)
at org.apache.deltaspike.core.impl.config.ConfigurationExtension.init(ConfigurationExtension.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:267)
at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52)
at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:137)
at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:263)
at org.jboss.weld.introspector.jlr.WeldMethodImpl.invokeOnInstance(WeldMethodImpl.java:170)
at org.jboss.weld.introspector.ForwardingWeldMethod.invokeOnInstance(ForwardingWeldMethod.java:51)
at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:154)
... 13 more
Caused by: java.lang.ClassCastException: Cannot cast org.apache.deltaspike.core.impl.config.DefaultConfigSourceProvider to org.apache.deltaspike.core.spi.config.ConfigSourceProvider
at java.lang.Class.cast(Class.java:3005)
at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:362)
... 34 more
at org.jboss.weld.bootstrap.events.AbstractDefinitionContainerEvent.fire(AbstractDefinitionContainerEvent.java:48)
at org.jboss.weld.bootstrap.events.BeforeBeanDiscoveryImpl.fire(BeforeBeanDiscoveryImpl.java:46)
at org.jboss.weld.bootstrap.WeldBootstrap.startInitialization(WeldBootstrap.java:335)
at org.jboss.as.weld.WeldStartService.start(WeldStartService.java:62)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
... 3 more
[0m[0m12:41:52,817 INFO [org.jboss.as.controller] (DeploymentScanner-threads - 2) JBAS014774: Service status report
JBAS014777: Services which failed to start: service jboss.deployment.unit."MyTestApp.ear".WeldStartService: org.jboss.msc.service.StartException in service jboss.deployment.unit."MyTestApp.ear".WeldStartService: Failed to start service
I've Googled around, but can't find any mention of similar errors. The app itself is based off a simple example app I found in the PicketLink 2.5.1 distribution, so it's not as though I'm doing anything terribly complex. Any idea what could be causing this or where I could start to look for answers?

Adding my comment as an answer
This is text book classloader error. You either have the same jar more than once in your classpath or your application somehow has at least two classloaders and each one loads a different copy of those classes