Schema validation failure when using MTOM with Apache CXF 2.5.2 - cxf

Question

I am using Apache CXF 2.5.2 to create a web service. I have created an endpoint and enabled mtom and schema validation using:
<jaxws:properties>
<entry key="mtom-enabled" value="true"/>
<entry key="schema-validation-enabled" value="true"/>
</jaxws:properties>
If I turn off the mtom-enabled property then the schema validates correctly. If I turn off the schema-validation-enabled property then the mtom works correctly.
<result>
<xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:2fd0125c-bfb6-454b-8a98-9e3a16083dca-9#cxf.apache.org">
</xop:Include>
</result>
My schema looks like this:
<xsd:complexType name="ResultList">
<xsd:sequence>
<xsd:element name="result" type="myns:ResultType"
minOccurs="0" maxOccurs="unbounded" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="ResultType">
<xsd:simpleContent>
<xsd:restriction base="xmime:base64Binary">
<xsd:attribute ref="xmime:contentType" use="required" />
</xsd:restriction>
</xsd:simpleContent>
</xsd:complexType>
My Base64Binary class looks somewhat like this:
public class Base64Binary
{
#Lob #XmlValue
protected byte[] value;
#XmlAttribute(namespace = "http://www.w3.org/2005/05/xmlmime")
protected String contentType;
}
With schema validation enabled I get the following error:
org.apache.cxf.interceptor.Fault: Marshalling Error: cvc-complex-type.2.2: Element 'result' must have no element [children], and the value must be valid.
at org.apache.cxf.jaxb.JAXBEncoderDecoder.marshall(JAXBEncoderDecoder.java:261)
at org.apache.cxf.jaxb.io.DataWriterImpl.write(DataWriterImpl.java:169)
at org.apache.cxf.interceptor.AbstractOutDatabindingInterceptor.writeParts(AbstractOutDatabindingInterceptor.java:119)
at org.apache.cxf.interceptor.BareOutInterceptor.handleMessage(BareOutInterceptor.java:68)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)
at org.apache.cxf.interceptor.OutgoingChainInterceptor.handleMessage(OutgoingChainInterceptor.java:77)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:123)
at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:207)
at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:213)
at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:154)
at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:126)
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:185)
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:108)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:164)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.xml.bind.MarshalException
- with linked exception:
[org.xml.sax.SAXParseException: cvc-complex-type.2.2: Element 'result' must have no element [children], and the value must be valid.]
at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(Unknown Source)
at org.apache.cxf.jaxb.JAXBEncoderDecoder.writeObject(JAXBEncoderDecoder.java:550)
at org.apache.cxf.jaxb.JAXBEncoderDecoder.marshall(JAXBEncoderDecoder.java:236)
... 29 more
Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.2: Element 'result' must have no element [children], and the value must be valid.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.elementLocallyValidComplexType(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.elementLocallyValidType(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.processElementContent(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl.endElement(Unknown Source)
at org.xml.sax.helpers.XMLFilterImpl.endElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.output.SAXOutput.endTag(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.output.XmlOutputAbstractImpl.endTag(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.output.ForkXmlOutput.endTag(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.output.MTOMXmlOutput.endTag(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.output.NamespaceContextImpl$Element.endElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.endElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayERProperty.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsXsiType(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsXsiType(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsXsiType(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsRoot(Unknown Source)
... 33 more
Any thoughts as to how to get around this validation error?
Thank you.

Answer 1

Can you set your "result" element to just:
<xsd:element name="result" type="xsd:base64Binary"
minOccurs="0" maxOccurs="unbounded" />
and seeing if that helps. Fundamentally, JAXB schema validation and mtom are not really compatible as the mtom stuff is handled after the validation (which is a bit wrong IMO). CXF does make some attempts to make it work together, but I think it can only do it if the element type is the base64Binary type directly.