Erro ao tentar inserir @SOAPBinding(style=Style.RPC) no código

Amigos, o código estava funcionando antes de tentar inserir a anotação @SOAPBinding.

Eis o trace:

Exception in thread "main" com.sun.xml.internal.ws.spi.db.DatabindingException: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
java.util.List é uma interface e JAXB não pode tratar interfaces.
    this problem is related to the following location:
        at java.util.List

    at com.sun.xml.internal.ws.db.glassfish.JAXBRIContextFactory.newContext(Unknown Source)
    at com.sun.xml.internal.ws.spi.db.BindingContextFactory.create(Unknown Source)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl$1.run(Unknown Source)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.createJAXBContext(Unknown Source)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.postProcess(Unknown Source)
    at com.sun.xml.internal.ws.model.RuntimeModeler.buildRuntimeModel(Unknown Source)
    at com.sun.xml.internal.ws.db.DatabindingImpl.<init>(Unknown Source)
    at com.sun.xml.internal.ws.db.DatabindingProviderImpl.create(Unknown Source)
    at com.sun.xml.internal.ws.db.DatabindingProviderImpl.create(Unknown Source)
    at com.sun.xml.internal.ws.db.DatabindingFactoryImpl.createRuntime(Unknown Source)
    at com.sun.xml.internal.ws.server.EndpointFactory.createSEIModel(Unknown Source)
    at com.sun.xml.internal.ws.server.EndpointFactory.create(Unknown Source)
    at com.sun.xml.internal.ws.server.EndpointFactory.createEndpoint(Unknown Source)
    at com.sun.xml.internal.ws.api.server.WSEndpoint.create(Unknown Source)
    at com.sun.xml.internal.ws.api.server.WSEndpoint.create(Unknown Source)
    at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.createEndpoint(Unknown Source)
    at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.publish(Unknown Source)
    at com.sun.xml.internal.ws.spi.ProviderImpl.createAndPublishEndpoint(Unknown Source)
    at javax.xml.ws.Endpoint.publish(Unknown Source)
    at br.com.caelum.estoque.ws.PublicaEstoqueWS.main(PublicaEstoqueWS.java:15)
Caused by: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
java.util.List é uma interface e JAXB não pode tratar interfaces.
    this problem is related to the following location:
        at java.util.List

    at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(Unknown Source)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(Unknown Source)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(Unknown Source)
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(Unknown Source)
    at com.sun.xml.internal.bind.api.JAXBRIContext.newInstance(Unknown Source)
    at com.sun.xml.internal.bind.api.JAXBRIContext.newInstance(Unknown Source)
    at com.sun.xml.internal.ws.developer.JAXBContextFactory$1.createJAXBContext(Unknown Source)
    ... 22 more

E o código:

@WebService
@SOAPBinding(style=Style.RPC)
public class EstoqueWS {

    private ItemDao dao = new ItemDao();

    @WebMethod(operationName="todosOsItens")
    @WebResult(name="item")
    @ResponseWrapper(localName="itens")
    @RequestWrapper(localName="listaItens")
    public List<Item>/*ListaItens*/ getItens(/*@WebParam(name="filtros") Filtros filtros*/){
        System.out.println("Chamando getItens()");
        //List<Filtro> lista = filtros.getLista();
        //List<Item> itensResultado = dao.todosItens(lista);
        //return new ListaItens(itensResultado); //criando uma ListaItens
        return dao.todosItens();
    }

    @WebMethod(operationName="CadastrarItem")
    @WebResult(name="item")
    @RequestWrapper(localName="ItemParaCadastro")
    @ResponseWrapper(localName="ItemCadastrado")
    public Item cadastrarItem(
            @WebParam(name="tokenUsuario", header=true) TokenUsuario token, 
            @WebParam(name="item") Item item) throws AutorizacaoException{
        System.out.println("Cadastrando " + item + ", " + token);

        boolean valido = new TokenDao().ehValido(token);

        if (!valido) {
            throw new AutorizacaoException("Token invalido");
        }

        new ItemValidador(item).validate();

        this.dao.cadastrar(item);
        return item;
    }

}