$ ant -Dtest=org.jboss.test.webservice.marshalltest.MarshallDocLiteralTestCase

Caused by: java.lang.ClassCastException: [I
at org.jboss.xml.binding.XercesXsMarshaller.marshalElement(XercesXsMarshaller.java:299)
at org.jboss.xml.binding.XercesXsMarshaller.marshalParticle(XercesXsMarshaller.java:469)
at org.jboss.xml.binding.XercesXsMarshaller.marshalModelGroupSequence(XercesXsMarshaller.java:583)
at org.jboss.xml.binding.XercesXsMarshaller.marshalModelGroup(XercesXsMarshaller.java:538)
at org.jboss.xml.binding.XercesXsMarshaller.marshalParticle(XercesXsMarshaller.java:462)
at org.jboss.xml.binding.XercesXsMarshaller.marshalComplexType(XercesXsMarshaller.java:449)
at org.jboss.xml.binding.XercesXsMarshaller.marshalElementType(XercesXsMarshaller.java:354)
at org.jboss.xml.binding.XercesXsMarshaller.marshalElement(XercesXsMarshaller.java:327)
at org.jboss.xml.binding.XercesXsMarshaller.marshalParticle(XercesXsMarshaller.java:469)
at org.jboss.xml.binding.XercesXsMarshaller.marshalModelGroupSequence(XercesXsMarshaller.java:583)
at org.jboss.xml.binding.XercesXsMarshaller.marshalModelGroup(XercesXsMarshaller.java:538)
at org.jboss.xml.binding.XercesXsMarshaller.marshalParticle(XercesXsMarshaller.java:462)
at org.jboss.xml.binding.XercesXsMarshaller.marshalComplexType(XercesXsMarshaller.java:449)
at org.jboss.xml.binding.XercesXsMarshaller.marshallInternal(XercesXsMarshaller.java:176)
at org.jboss.xml.binding.XercesXsMarshaller.marshal(XercesXsMarshaller.java:141)
at org.jboss.ws.jaxb.JAXBMarshallerImpl.marshal(JAXBMarshallerImpl.java:89)

In the beginning the WS layer had the same issue. It consequnetly converts primitves to their corresponding wrapper types and visa versa on entry and exit. Internally it only deals with wrapper types. See the usage of org.jboss.util.JavaUtils