Here's the rest of the story. I finally stumbled on the right recipe, and here 'tis. I was over-complicating things. Removing almost all the annotations fixed both the list-passing and the WSDL. Interface: import java.util.ArrayList; | import javax.ejb.Remote; // for the EJB | import javax.jws.WebService; // for the web service | import com.kepler.ecom.domain.OrderLine; | | @Remote | @WebService | public interface OrderTakerRemote { | public String msg(ArrayList<String> say); | } Implementation: import javax.ejb.Stateless; | import javax.jws.WebService; | import com.aviall.kepler.ecom.domain.OrderLine; | import com.aviall.kepler.ecom.services.OrderTakerRemote; | import java.util.ArrayList; | | @WebService | @Stateless | public class OrderTaker implements OrderTakerRemote { | public OrderTaker() { | } | | public String msg(ArrayList<String> say) { | // Use the list here | } | } View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4268317#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...