diff -r 8c0b6bccfe47 -r 0989ad8c0860 src/share/jaxws_classes/com/sun/xml/internal/bind/v2/schemagen/XmlSchemaGenerator.java
--- a/src/share/jaxws_classes/com/sun/xml/internal/bind/v2/schemagen/XmlSchemaGenerator.java	Thu Apr 04 19:05:24 2013 -0700
+++ b/src/share/jaxws_classes/com/sun/xml/internal/bind/v2/schemagen/XmlSchemaGenerator.java	Tue Apr 09 14:51:13 2013 +0100
@@ -1068,9 +1068,11 @@
                                     elemName = te.getElementName();
                                 }
 
-                                Collection refs = propInfo.ref();
-                                if ((refs != null) && (!refs.isEmpty()) && (elemName != null)) {
-                                    ClassInfoImpl cImpl = (ClassInfoImpl)refs.iterator().next();
+                                Collection<TypeInfo> refs = propInfo.ref();
+                                TypeInfo ti;
+                                if ((refs != null) && (!refs.isEmpty()) && (elemName != null)
+                                        && ((ti = refs.iterator().next()) == null || ti instanceof ClassInfoImpl)) {
+                                    ClassInfoImpl cImpl = (ClassInfoImpl)ti;
                                     if ((cImpl != null) && (cImpl.getElementName() != null)) {
                                         e.ref(new QName(cImpl.getElementName().getNamespaceURI(), tn.getLocalPart()));
                                     } else {