Encounter a UndeclearedPrefix Even When the XML Namespace is Defined in JBoss EAP

Issue

When deploying an application, I receive exceptions caused by

Caused by: javax.xml.ws.WebServiceException: org.xml.sax.SAXParseException: s4s-att-invalid-value: Invalid attribute value for 'type' in element 'element'. Reco
rded reason: UndeclaredPrefix: Cannot resolve 'ns1:claim' as a QName: the prefix 'ns1' is not declared.
        at com.sun.xml.ws.server.ServerSchemaValidationTube.<init>(ServerSchemaValidationTube.java:105)
        at com.sun.xml.ws.api.pipe.ServerTubeAssemblerContext.createValidationTube(ServerTubeAssemblerContext.java:214)
        at com.sun.xml.ws.assembler.TubelineAssemblyController$ValidationTubeAppender.appendTube(TubelineAssemblyController.java:305)
        at com.sun.xml.ws.assembler.TubelineAssemblerFactoryImpl$WsitTubelineAssembler.createServer(TubelineAssemblerFactoryImpl.java:101)
        at com.sun.xml.ws.server.WSEndpointImpl.<init>(WSEndpointImpl.java:152)
        at com.sun.xml.ws.server.EndpointFactory.createEndpoint(EndpointFactory.java:218)
        at com.sun.xml.ws.api.server.WSEndpoint.create(WSEndpoint.java:467)
        at org.jvnet.jax_ws_commons.spring.SpringService.getObject(SpringService.java:333)
        at org.jvnet.jax_ws_commons.spring.SpringService.getObject(SpringService.java:45)
        at org.springframework.beans.factory.support.FactoryBeanRegistrySupport$1.run(FactoryBeanRegistrySupport.java:121)
        ... 154 more
Caused by: org.xml.sax.SAXParseException: s4s-att-invalid-value: Invalid attribute value for 'type' in element 'element'. Recorded reason: UndeclaredPrefix: Can
not resolve 'ns1:claim' as a QName: the prefix 'ns1' is not declared.
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:236)
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:172)
        at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:382)
        at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaError(XSDHandler.java:2241)
        at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSAttributeChecker.reportSchemaError(XSAttributeChecker.java:1633)
        at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSAttributeChecker.checkAttributes(XSAttributeChecker.java:1206)
        at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSAttributeChecker.checkAttributes(XSAttributeChecker.java:1025)
        at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDElementTraverser.traverseLocal(XSDElementTraverser.java:185)
        at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.traverseLocalElements(XSDHandler.java:1781)
        at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:484)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:556)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:523)
        at com.sun.org.apache.xerces.internal.jaxp.validation.xs.SchemaFactoryImpl.newSchema(SchemaFactoryImpl.java:206)
        at com.sun.xml.ws.server.ServerSchemaValidationTube.<init>(ServerSchemaValidationTube.java:103)
        ... 163 more