Thanks for your reply I installed JBoss 4.2, I am running the messaging server. I installed the most recent ws files using the ant build in the jbossws-native-2.0.0.GA release. All the right files are now deployed to the default/deploy and messaging/deploy jbossws.sar directories. I fixed the jboss-xml-binding issue about 3 hours ago by changing the order in which the jars are loaded into my class path in eclipse. After 5 days solid on this, I now feel I am at the final hurdle: I am now getting the same problem from both the java client and the SOAP UI client:-- Exception in thread "main" java.lang.reflect.UndeclaredThrowableException at $Proxy0.echo(Unknown Source) at com.cmmgroup.address.client.EchoClient.main(EchoClient.java:32) Caused by: java.rmi.RemoteException: Call invocation failed; nested exception is: java.lang.UnsupportedOperationException: setProperty must be overridden by all subclasses of SOAPMessage at org.jboss.ws.core.jaxrpc.client.CallImpl.invokeInternal(CallImpl.java:536) at org.jboss.ws.core.jaxrpc.client.CallImpl.invoke(CallImpl.java:277) at org.jboss.ws.core.jaxrpc.client.PortProxy.invoke(PortProxy.java:151) ... 2 more Caused by: java.lang.UnsupportedOperationException: setProperty must be overridden by all subclasses of SOAPMessage at javax.xml.soap.SOAPMessage.setProperty(Unknown Source) at org.jboss.ws.core.soap.SOAPMessageImpl.(SOAPMessageImpl.java:67) at org.jboss.ws.core.soap.MessageFactoryImpl.createMessage(MessageFactoryImpl.java:155) at org.jboss.ws.core.CommonSOAP11Binding.createMessage(CommonSOAP11Binding.java:58) at org.jboss.ws.core.CommonSOAPBinding.bindRequestMessage(CommonSOAPBinding.java:156) at org.jboss.ws.core.CommonClient.invoke(CommonClient.java:289) at org.jboss.ws.core.jaxrpc.client.CallImpl.invokeInternal(CallImpl.java:517) ... 4 more The release notes for the latest version of jbossws tells me that this issue should be fixed. I understand that getting this error message means that I am not running the right version of jboss-saaj. But I can assure you that I am - everywhere! I've deleted every other saaj jar on my hard drive, including those in the eclipse plug in directories. I've definitely got the right jboss-saaj with the right setProperty() method in my eclipse classpath. Clutching at straws, I read somewhere about adding the jaxb_api and jaxws-api jars to my JDK and JRE lib/endorsed directories (I am running jdk 6) - but that doesn't seem to make a difference The bus was late, thank goodness, but I've really got to get the sorted. I've spent way too long on it already.... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4066700#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...