I tried to use the xs-security example shipped with XFire and i ran
into the following stackTrace:

javax.xml.stream.XMLStreamException: NamespaceURI cannot be null
org.codehaus.xfire.XFireRuntimeException: Could not invoke service..
Nested exception is org.codehaus.xfire.fault.XFireFault: NamespaceURI
cannot be null
org.codehaus.xfire.fault.XFireFault: NamespaceURI cannot be null
        at org.codehaus.xfire.fault.XFireFault.createFault(XFireFault.java:89)
        at 
org.codehaus.xfire.util.dom.DOMSerializer.writeMessage(DOMSerializer.java:47)
        at 
org.codehaus.xfire.transport.http.HttpChannel.writeWithoutAttachments(HttpChannel.java:56)
        at 
org.codehaus.xfire.transport.http.CommonsHttpMessageSender.getByteArrayRequestEntity(CommonsHttpMessageSender.java:422)
        at 
org.codehaus.xfire.transport.http.CommonsHttpMessageSender.send(CommonsHttpMessageSender.java:360)
        at 
org.codehaus.xfire.transport.http.HttpChannel.sendViaClient(HttpChannel.java:123)
        at 
org.codehaus.xfire.transport.http.HttpChannel.send(HttpChannel.java:48)
        at 
org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:26)
        at 
org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
        at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:79)
        at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:114)
        at org.codehaus.xfire.client.Client.invoke(Client.java:336)
        at 
org.codehaus.xfire.client.XFireProxy.handleRequest(XFireProxy.java:77)
        at org.codehaus.xfire.client.XFireProxy.invoke(XFireProxy.java:57)
        at $Proxy11.getDdmById(Unknown Source)
        at DmanUserTokenPP.getDdm(DmanUserTokenPP.java:96)
        at DmanUserTokenPP.executeClient(DmanUserTokenPP.java:75)
        at DmanUserTokenPP.main(DmanUserTokenPP.java:54)
Caused by: javax.xml.stream.XMLStreamException: NamespaceURI cannot be null
        at 
com.sun.xml.stream.writers.XMLStreamWriterImpl.writeAttribute(XMLStreamWriterImpl.java:620)
        at org.codehaus.xfire.util.STAXUtils.writeElement(STAXUtils.java:366)
        at org.codehaus.xfire.util.STAXUtils.writeNode(STAXUtils.java:391)
        at org.codehaus.xfire.util.STAXUtils.writeElement(STAXUtils.java:380)
        at org.codehaus.xfire.util.STAXUtils.writeNode(STAXUtils.java:391)
        at org.codehaus.xfire.util.STAXUtils.writeElement(STAXUtils.java:380)
        at org.codehaus.xfire.util.STAXUtils.writeNode(STAXUtils.java:391)
        at org.codehaus.xfire.util.STAXUtils.writeElement(STAXUtils.java:380)
        at org.codehaus.xfire.util.STAXUtils.writeNode(STAXUtils.java:391)
        at org.codehaus.xfire.util.STAXUtils.writeElement(STAXUtils.java:380)
        at org.codehaus.xfire.util.STAXUtils.writeDocument(STAXUtils.java:285)
        at 
org.codehaus.xfire.util.dom.DOMSerializer.writeMessage(DOMSerializer.java:40)
        ... 16 more


I found in the forum that another user had this problem but no answer was given.

I have found that it is an issue with incompatible jars (or jars not
in the right order in the classpath), but i haven't found which one
yet.

I just wanted to share that with everyone :-)

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