error when deploying Java WS in Jboss 6.3.0 EAP

I am migrating an application with Java WS from Jboss 5.1.0 to Jboss 6.3.0 EAP. It works fine with Jboss 5.1.0 but I am getting error while deploying the same in Jboss 6.3.0 EAP.

14:42:10,887 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC000001: Failed to start service jboss.deploy
ment.unit."my-app.war".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."dtm-banking.
war".INSTALL: JBAS018733: Failed to process phase INSTALL of deployment "dtm-banking.war"
        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:166) [jboss-a
s-server-7.4.0.Final-redhat-19.jar:7.4.0.Final-redhat-19]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1980) [jboss-ms
c-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1913) [jboss-msc-1.1.5.F
inal-redhat-1.jar:1.1.5.Final-redhat-1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_60]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_60]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_60]
Caused by: javax.xml.ws.WebServiceException: java.lang.reflect.UndeclaredThrowableException
        at org.apache.cxf.jaxws.EndpointImpl.doPublish(EndpointImpl.java:371)
        at org.jboss.wsf.stack.cxf.deployment.EndpointImpl.doPublish(EndpointImpl.java:66)
        at org.apache.cxf.jaxws.EndpointImpl.publish(EndpointImpl.java:251)
        at org.apache.cxf.jaxws.EndpointImpl.publish(EndpointImpl.java:539)
        at org.jboss.wsf.stack.cxf.configuration.NonSpringBusHolder.configure(NonSpringBusHolder.java:118)
        at org.jboss.wsf.stack.cxf.deployment.aspect.BusDeploymentAspect.startDeploymentBus(BusDeploymentAspect.java:137
)
        at org.jboss.wsf.stack.cxf.deployment.aspect.BusDeploymentAspect.start(BusDeploymentAspect.java:69)
        at org.jboss.as.webservices.deployers.AspectDeploymentProcessor.deploy(AspectDeploymentProcessor.java:74)
        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:159) [jboss-a
s-server-7.4.0.Final-redhat-19.jar:7.4.0.Final-redhat-19]
        ... 5 more
Caused by: java.lang.reflect.UndeclaredThrowableException
        at com.sun.proxy.$Proxy371.visitLabel(Unknown Source)
        at org.apache.cxf.jaxws.WrapperClassGenerator.createWrapperClass(WrapperClassGenerator.java:213)
        at org.apache.cxf.jaxws.WrapperClassGenerator.generate(WrapperClassGenerator.java:122)
        at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.generatedWrapperBeanClass(JaxWsServiceFactoryBean.java:6
83)
        at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.getExtraClass(JaxWsServiceFactoryBean.java:653)
        at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromClass(ReflectionServiceFactoryBea
n.java:484)
        at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.buildServiceFromClass(JaxWsServiceFactoryBean.java:704)
        at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBe
an.java:550)
        at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:265)
        at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.create(JaxWsServiceFactoryBean.java:215)
        at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java
:102)
        at org.apache.cxf.frontend.ServerFactoryBean.create(ServerFactoryBean.java:159)
        at org.apache.cxf.jaxws.JaxWsServerFactoryBean.create(JaxWsServerFactoryBean.java:211)
        at org.apache.cxf.jaxws.EndpointImpl.getServer(EndpointImpl.java:456)
        at org.apache.cxf.jaxws.EndpointImpl.doPublish(EndpointImpl.java:334)
        ... 13 more
Caused by: java.lang.NoSuchMethodException: org.objectweb.asm.MethodWriter.visitLabel(org.objectweb.asm.Label)
        at java.lang.Class.getMethod(Class.java:1665) [rt.jar:1.7.0_60]
        at org.apache.cxf.common.util.ReflectionInvokationHandler.invoke(ReflectionInvokationHandler.java:85)
        ... 28 more

I understand Jboss 6.3.0 EAP uses CXF implementation for webservice, but I am looking for simple Java WS to use the standard jee environment.

tried the following in jboss-deployment-structure.xml

<exclude-subsystems>
    <subsystem name="webservices" />
</exclude-subsystems>

this got rid of the exception at deployment time but I get a Classcast exception when invoking the wsdl for the service

http://localhost:8080/myapp/myservice?wsdl

JBWEB000235: Allocate exception for servlet MyWebService: java.lang.ClassCastException: com.example.webservice.endpoint.DataService cannot be cast to javax.servlet.Servlet

any idea?