No adapter for endpoint

[RShelley]

I've read a few other threads related to this, but it doesn't seem that I've discovered my fault. I've created a Java class with @Endpoint and @PayloadRoot annotations, configured the Marshalling beans as per the airline example, however, I continue to get this error. Below are examples of my code (trimmed for brevity, doesn't include the WSDL generator). Hopefully someone can see something I overlooked. For reference, I'm using Netbeans 6.0 (which has some nice support for JAXB Binding generation, btw), Java 1.5, Spring 2.0, and Spring WS 1.0.2, and JAXB 2.1.

Full Error

No adapter for endpoint [public javax.xml.bind.JAXBElement<com.mg21.ws.bindings.catalog.Product> com.mg21.shotgun.ws.endpoint.ProductEndpoint.productRequest(int)]: Does your endpoint implement a supported interface like MessageHandler or PayloadEndpoint?

catalog-ws-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

    <bean class="org.springframework.ws.server.endpoint.mapping.PayloadRootAnnotationMethodEndpointMapping">
        <property name="interceptors">
            <list>
                <bean class="org.springframework.ws.server.endpoint.interceptor.PayloadLoggingInterceptor"/>
                <bean class="org.springframework.ws.soap.server.endpoint.interceptor.PayloadValidatingInterceptor">
                    <property name="schema" value="/WEB-INF/schemas/catalog.xsd"/>
                    <property name="validateRequest" value="true"/>
                    <property name="validateResponse" value="true"/>
                </bean>
            </list>
        </property>
        <property name="order" value="1"/>
    </bean>

    <bean id="marshallingEndpoint" class="com.mg21.ws.endpoint.ProductEndpoint">
        <description>
            This endpoint handles echo requests.
        </description>
        <property name="productService" ref="productService"/>
    </bean>

    <bean id="productService" class="com.mg21.ws.service.ProductService">
        <description>
            This bean is our "business" service.
        </description>
    </bean>

    <bean id="marshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
        <description>
            The JAXB 2 Marshaller is used by the endpoints.
        </description>
        <property name="contextPath" value="com.mg21.ws.bindings.catalog"/>
    </bean>
    
    <bean class="org.springframework.ws.server.endpoint.adapter.GenericMarshallingMethodEndpointAdapter">
        <description>
            This adapter allows for methods that need and returns marshalled objects. The MarshallingEndpoint
            uses JAXB 2 objects.
        </description>
        <constructor-arg ref="marshaller"/>
    </bean>
</beans>

ProductEndpoint.java

@Endpoint
public class ProductEndpoint {

    public static final String NAMESPACE_URI = "http://www.12gaugemedia.com/ws/services/catalog";

    public static final String PRODUCT_REQUEST_LOCAL_NAME = "productRequest";

    public static final String PRODUCT_RESPONSE_LOCAL_NAME = "productResponse";

    private ProductService productService;
    
    private ObjectFactory objectFactory = new ObjectFactory();
    
    @PayloadRoot(localPart = PRODUCT_REQUEST_LOCAL_NAME, namespace = NAMESPACE_URI)
    public JAXBElement<Product> productRequest(int id){      
      return objectFactory.createProductResponse(productService.productRequest(id));
    }
    
    public void setProductService(ProductService productService) {
      this.productService = productService;
    }
}

ProductRequest.java

public class ProductService {

  public Product productRequest (int i){
      Product product = new Product();
      product.setName("Product 1");
      product.setDescr("Lorem Ipsum");
      product.setBlurb("Dolor Amit");
      return product;
  }
}

catalog.xsd

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="qualified"
        targetNamespace="http://www.12gaugemedia.com/ws/services/catalog"
        xmlns:tns="http://www.12gaugemedia.com/ws/services/catalog">
  
  <element name="productRequest">
    <simpleType>
      <restriction base = "int">
        <pattern value="([\d])+"/>
      </restriction>
    </simpleType>
  </element>
  
  <element name="productResponse" type="tns:Product" />
  
  <complexType name="Product">
    <all>
      <element name="name" />
      <element name="descr" />
      <element name="blurb" />
    </all>
  </complexType>
  
</schema>

Thanks!