While running jbossws-native testsuite I experience this issue:
14:15:38,177 INFO [Ejb3DependenciesDeployer] Encountered deployment AbstractVFSDeploymentContext@8211634

14:15:43,383 INFO [JBossASKernel] Created KernelDeployment for: jaxws-jbws944.jar
14:15:43,390 INFO [JBossASKernel] installing bean: jboss.j2ee:jar=jaxws-jbws944.jar,name=FooBean01,service=EJB3
14:15:43,390 INFO [JBossASKernel] with dependencies:
14:15:43,390 INFO [JBossASKernel] and demands:
14:15:43,390 INFO [JBossASKernel] jboss.ejb:service=EJBTimerService
14:15:43,390 INFO [JBossASKernel] and supplies:
14:15:43,391 INFO [JBossASKernel] jndi:FooBean01/remote
14:15:43,391 INFO [JBossASKernel] Class:org.jboss.test.ws.jaxws.jbws944.EJB3RemoteBusinessInterface
14:15:43,391 INFO [JBossASKernel] jndi:FooBean01/remote-org.jboss.test.ws.jaxws.jbws944.EJB3RemoteBusinessInterface
14:15:43,391 INFO [JBossASKernel] Class:org.jboss.test.ws.jaxws.jbws944.EJB3RemoteHome
14:15:43,391 INFO [JBossASKernel] Added bean(jboss.j2ee:jar=jaxws-jbws944.jar,name=FooBean01,service=EJB3) to KernelDeployment of: jaxws-jbws944.jar
14:15:44,026 INFO [SessionSpecContainer] Starting jboss.j2ee:jar=jaxws-jbws944.jar,name=FooBean01,service=EJB3
14:15:44,073 INFO [EJBContainer] STARTED EJB: org.jboss.test.ws.jaxws.jbws944.EJB3Bean01 ejbName: FooBean01
14:15:45,312 INFO [JndiSessionRegistrarBase] Binding the following Entries in Global JNDI:

FooBean01/remote - EJB3.x Default Remote Business Interface
FooBean01/remote-org.jboss.test.ws.jaxws.jbws944.EJB3RemoteBusinessInterface - EJB3.x Remote Business Interface

14:15:45,891 ERROR [AbstractKernelController] Error installing to PreInstall: name=jboss.j2ee:jar=jaxws-jbws944.jar,name=FooBean01,service=EJB3_IORFactory state=Real
java.lang.NoClassDefFoundError: org/jboss/iiop/WebCL
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at org.jboss.classloader.spi.base.BaseClassLoader.access$200(BaseClassLoader.java:63)
at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:572)
at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:532)
at java.security.AccessController.doPrivileged(Native Method)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:530)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:507)
at org.jboss.classloader.spi.base.BaseDelegateLoader.loadClass(BaseDelegateLoader.java:134)
at org.jboss.classloader.spi.filter.FilteredDelegateLoader.loadClass(FilteredDelegateLoader.java:131)
at org.jboss.classloader.spi.base.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:452)
at org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:267)
at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:166)
at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:265)
at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1119)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:798)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:441)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getDeclaredConstructors(Class.java:1836)
at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryImpl.getDeclaredConstructors(IntrospectionTypeInfoFactoryImpl.java:489)
at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryImpl.getConstructors(IntrospectionTypeInfoFactoryImpl.java:146)
at org.jboss.reflect.plugins.ClassInfoImpl.getDeclaredConstructors(ClassInfoImpl.java:424)
at org.jboss.beans.info.plugins.AbstractBeanInfoFactory.getConstructors(AbstractBeanInfoFactory.java:206)
at org.jboss.beans.info.plugins.AbstractBeanInfoFactory.getBeanInfo(AbstractBeanInfoFactory.java:151)
at org.jboss.config.plugins.AbstractConfiguration.getBeanInfo(AbstractConfiguration.java:87)
at org.jboss.kernel.plugins.config.AbstractKernelConfig.getBeanInfo(AbstractKernelConfig.java:80)
at org.jboss.kernel.plugins.config.AbstractKernelConfigurator.getBeanInfo(AbstractKernelConfigurator.java:77)
at org.jboss.kernel.plugins.config.AbstractKernelConfigurator.getBeanInfo(AbstractKernelConfigurator.java:96)
at org.jboss.kernel.plugins.dependency.PreInstallAction.installActionInternal(PreInstallAction.java:90)
at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:54)
at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:42)
at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62)
at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71)
at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51)
at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1633)
at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:935)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1083)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:985)
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:775)
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:540)
at org.jboss.deployers.vfs.deployer.kernel.BeanMetaDataDeployer.deploy(BeanMetaDataDeployer.java:121)
at org.jboss.deployers.vfs.deployer.kernel.BeanMetaDataDeployer.deploy(BeanMetaDataDeployer.java:51)
at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.internalDeploy(AbstractSimpleRealDeployer.java:62)
at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:50)
at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:171)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1440)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1158)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1179)
at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1099)
at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1633)
at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:935)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1083)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:985)
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:823)
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553)
at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:782)
at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:702)
at org.jboss.system.server.profileservice.repository.MainDeployerAdapter.process(MainDeployerAdapter.java:117)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:409)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:294)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:181)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:205)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: org.jboss.iiop.WebCL
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:292)
at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1119)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:798)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:441)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
... 74 more

I have tried this on EAP 5.0.1.GA and EWP 5.0.0.GA and the problem doesn't exist there.
Some Hudson references to see the failing tests:
http://hudson.qa.jboss.com/hudson/view/EWP/job/ewp-5-jbossws-rhel/jdk=java16_default,label=RHEL5_x86_64/lastCompletedBuild/testReport/org.jboss.test.ws.jaxws.jbws944/JBWS944TestCase/
http://hudson.qa.jboss.com/hudson/view/EWP/job/ewp-5-jbossws-rhel/jdk=java16_default,label=RHEL5_x86/7/testReport/org.jboss.test.ws.jaxws.jbws944/JBWS944TestCase/