I updated my JBoss 4.2 installation to JBossWS 2.0. Only minor modifications where necessary for ANT build.xml files (JARs changed regarding classpath, classes for ANT tasks changed). However, if I run my JBossWS clients I get this stacktrace. What's going on? Any hint is appreciated! When testing with the generic WS test client of the Eclipse plugin WTP everything works fine. java.lang.ExceptionInInitializerError | at java.lang.reflect.Constructor.newInstance(Constructor.java:513) | at java.lang.Class.newInstance0(Class.java:355) | at java.lang.Class.newInstance(Class.java:308) | at javax.xml.ws.spi.FactoryFinder.newInstance(FactoryFinder.java:36) | at javax.xml.ws.spi.FactoryFinder.find(FactoryFinder.java:95) | at javax.xml.ws.spi.Provider.provider(Provider.java:76) | at javax.xml.ws.Service.(Service.java:57) | at de.hska.wsgen.KundenverwaltungService.(KundenverwaltungService.java:41) | at de.hska.test.WebServicesJBossWSTest.setupProxy(WebServicesJBossWSTest.java:44) | Caused by: javax.xml.ws.WebServiceException: Error creating JAXBContext for W3CEndpointReference. | at com.sun.xml.ws.spi.ProviderImpl.getEPRJaxbContext(ProviderImpl.java:188) | at com.sun.xml.ws.spi.ProviderImpl.(ProviderImpl.java:65) | Caused by: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions | Two classes have the same XML type name "address". Use @XmlType.name and @XmlType.namespace to assign different names to them. | this problem is related to the following location: | at com.sun.xml.ws.developer.MemberSubmissionEndpointReference$Address | at public com.sun.xml.ws.developer.MemberSubmissionEndpointReference$Address com.sun.xml.ws.developer.MemberSubmissionEndpointReference.addr | at com.sun.xml.ws.developer.MemberSubmissionEndpointReference | this problem is related to the following location: | at javax.xml.ws.wsaddressing.W3CEndpointReference$Address | at private javax.xml.ws.wsaddressing.W3CEndpointReference$Address javax.xml.ws.wsaddressing.W3CEndpointReference.address | at javax.xml.ws.wsaddressing.W3CEndpointReference | Two classes have the same XML type name "elements". Use @XmlType.name and @XmlType.namespace to assign different names to them. | this problem is related to the following location: | at com.sun.xml.ws.developer.MemberSubmissionEndpointReference$Elements | at public com.sun.xml.ws.developer.MemberSubmissionEndpointReference$Elements com.sun.xml.ws.developer.MemberSubmissionEndpointReference.referenceProperties | at com.sun.xml.ws.developer.MemberSubmissionEndpointReference | this problem is related to the following location: | at javax.xml.ws.wsaddressing.W3CEndpointReference$Elements | at private javax.xml.ws.wsaddressing.W3CEndpointReference$Elements javax.xml.ws.wsaddressing.W3CEndpointReference.referenceParameters | at javax.xml.ws.wsaddressing.W3CEndpointReference | | at com.sun.xml.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:66) | at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:422) | at com.sun.xml.bind.v2.runtime.JAXBContextImpl.(JAXBContextImpl.java:270) | at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:103) | at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:81) | at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:210) | at javax.xml.bind.ContextFinder.find(ContextFinder.java:366) | at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:574) | at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:522) | at com.sun.xml.ws.spi.ProviderImpl.getEPRJaxbContext(ProviderImpl.java:186) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4062337#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...