Problema com JSF e HIBERNATE (BUSCA)

public List consultarTitulos (String titulo){
            session = ConnectionLivrariaFactory.getInstance();
            Query query = session.createQuery("from Livros l where l.titulo like :titulo");
            List list = query.setString("titulo", "%"+titulo+"%").list();
            return list;
        }

public abstract List consultarTitulos(String titulo);

public String getKeysearch(){
       return keysearch;
   }

   public void setKeysearch(String keysearch){
       this.keysearch = keysearch;
   }


public DataModel getBuscaLivros(){
       InterfaceLivrosDAO idao = new LivrariaDAO();
       model =
               new ListDataModel(idao.consultarTitulos(keysearch));
       return model;
   }

<f:view>
             <h:form id="buscar">
                 <h:panelGrid columns="2">
                     <f:facet name="header">
                         <h:outputText value="Busca de Livros" />
                     </f:facet>
                     <h:outputText value="Titulo: " />
                     <h:inputText size="30" id="titulo" value = "#{LivrosView.keysearch}" />
                     <%-- METODO QUE CHAMA MEUPACOTE.CONTROLLER --%>
               </h:panelGrid>
                 <h:commandButton value="Buscar" action="buscar"  />
            </h:form>
</f:view>

<f:view>
            <h:messages />
            <h1>Livros Encontrados</h1>
            <h:form>
                <h:dataTable value='#{livrosView.BuscarLivro}'
                         var='item' border="1"
                         cellpadding="2" cellspacing="0">
                      <h:column>
                         <f:facet name="header">
                             <h:outputText value="ISBN" />
                        </f:facet>
                     </h:column>
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="Título" />
                        </f:facet>
                    <h:outputText value="#{item.titulo}"/>
                  </h:column>
                 <h:column>
                    <f:facet name="header">
                        <h:outputText value="Publicacao em" />
                    </f:facet>
                    <h:outputText value="#{item.publicacao}"/>
                </h:column>

                <h:column>
                    <f:facet name="header">
                        <h:outputText value="Excluir Livros" />
                    </f:facet>
                </h:column>
           </h:dataTable>
            <h:commandLink action="#{livrosView.novoLivro}"
                           value="Cadastrar novo livro" />
    </h:form>
        </f:view>
    </body>
</html>

<faces-config>

<!--- O Bean LivrosController -->
<managed-bean>
    <managed-bean-name>livrosView</managed-bean-name>
    <managed-bean-class>
        meupacote.controller.LivrosController
   </managed-bean-class>
   <managed-bean-scope>session</managed-bean-scope>
   </managed-bean>

  

  
<!-- Cadastro de novo livro -->
 <navigation-rule>
       <display-name>formLivros</display-name>
       <from-view-id>/formLivros.jsp</from-view-id>
       <navigation-case>
           <from-outcome>sucesso_ins</from-outcome>
           <to-view-id>/mostrarLivros.jsp</to-view-id>
       </navigation-case>
   </navigation-rule>

   <!-- Chamada ao formulario de cadastro de livro -->
 <navigation-rule>
       <display-name>menu</display-name>
       <from-view-id>/menu.jsp</from-view-id>
       <navigation-case>
           <from-outcome>novo</from-outcome>
           <to-view-id>/formLivros.jsp</to-view-id>
       </navigation-case>
   </navigation-rule>

<!--Sucesso da exclusão do Livro -->
<navigation-rule>
       <display-name>mostraLivros</display-name>
       <from-view-id>/mostrarLivros.jsp</from-view-id>
       <navigation-case>
           <from-outcome>sucesso_exc</from-outcome>
           <to-view-id>/mostrarLivros.jsp</to-view-id>
       </navigation-case>
   </navigation-rule>


   <!-- Mostrando livro pesquisado -->
 <navigation-rule>
     <navigation-case>
           <from-outcome>buscar</from-outcome>
           <to-view-id>/mostrarLivrosPesquisado.jsp</to-view-id>
      </navigation-case>
   </navigation-rule>

  
</faces-config>