Fórum selectOneMenu(Primefaces) interagindo com mysql #561763

<h:form>
						<h:panelGrid columns="2" cellpadding="3" styleClass="paineis">

							<h:outputLabel for="categoria1" value="Categoria 1:" />
							<p:selectOneMenu id="categoria1" value="#{procurar.selectedItem}">
								<p:ajax listener="#{procurar.defineCategoria2}"
									update="categoria2 categoria3" />
								<f:selectItems value="#{procurar.categoria1}" />
							</p:selectOneMenu>


							<h:outputLabel for="categoria2" value="Categoria 2:" />
							<p:selectOneMenu id="categoria2"
								value="#{procurar.selectedItem2}">
								<p:ajax listener="#{procurar.defineCategoria3}"
									update="categoria3" />
								<f:selectItems value="#{procurar.categoria2}" />
							</p:selectOneMenu>

							<h:outputLabel for="categoria3" value="Categoria 3:" />
							<p:selectOneMenu id="categoria3"
								value="#{procurar.selectedItem3}">
								<f:selectItems value="#{procurar.categoria3}" />
							</p:selectOneMenu>
						</h:panelGrid>	
					</h:form>

public List<Item> getlistItems() throws SQLException {
		Connect2 con = new Connect2();
		List<Item> listaItems = con.listItems();
		return listaItems;
	}

public List<Item> listItems() {
 
          ArrayList<Item> lista = new ArrayList<Item>();
 
          Statement st = null;
          ResultSet rs = null;
 
          try {
                st = con.createStatement();
                String sql = "select * from item ";
               rs = st.executeQuery(sql);
 
                while (rs.next()) {
 
                     Item item = new Item();
                     item.setCod_id(rs.getInt(1));
                     item.setCod_icone(rs.getString(2));
                     item.setNome_item(rs.getString(3));
                     item.setServidor(rs.getString(4));
                     item.setRefinacao(rs.getString(5));
                     item.setVendedor(rs.getString(6));
                     item.setPreco(rs.getString(7));
                     item.setDescricao(rs.getString(8));
                     item.setDataCadastro(rs.getDate(9));
                     lista.add(item);
                }
 
          } catch (SQLException ex) {
                Logger lgr = Logger.getLogger(Connect2.class.getName());
                lgr.log(Level.SEVERE, ex.getMessage(), ex);
 
          } finally {
                try {
                     if (rs != null) {
                          rs.close();
                     }
                     if (st != null) {
                          st.close();
                     }
                     if (con != null) {
                          con.close();
                     }
 
                } catch (SQLException ex) {
                     Logger lgr = Logger.getLogger(Connect2.class.getName());
                     lgr.log(Level.WARNING, ex.getMessage(), ex);
                }
          }
          return lista;
     }

<p:dataTable var="item" value="#{itemMB.listItems}" rows="15"
			paginator="true" paginatorPosition="bottom" selectionMode="single"
			selection="#{itemMB.item}" rowKey="#{item.cod_id}"
			emptyMessage="Lista vazia" scrollable="true" scrollHeight="456">

			<p:column style="width: 40px">
				<h:graphicImage
					value="resources/images/equipamentos/#{item.cod_icone}.png" />
			</p:column>

			<p:column headerText="Nome">
				<h:outputText value="#{item.nome_item}" />
			</p:column>

			<p:column headerText="Servidor" style="width: 50px">
				<h:outputText value="#{item.servidor}" />
			</p:column>

			<p:column headerText="Ref" style="width: 25px">
				<h:outputText value="#{item.refinacao}" />
			</p:column>

			<p:column headerText="Decrição" style="width: 100px">
				<h:outputText value="#{item.descricao}" />
			</p:column>

			<p:column headerText="Preço" style="width: 50px">
				<h:outputText value="#{item.preco}" />
			</p:column>

		</p:dataTable>