Why not refresh jsf page

[Minh Phuc]

I create a bean as

@ManagedBean
@RequestScoped
public class KhachHangMB implements Serializable {

    @PersistenceContext(unitName = "XoSoWebPU")
    private EntityManager em;
    private List<KhachHang> l;

    public KhachHangMB() {
        l = new ArrayList<KhachHang>();
    }
    @PostConstruct
    public void init() {
        l = new ArrayList<KhachHang>();
        l = em.createNamedQuery("KhachHang.findAll").getResultList();
        MsgShow.showMsg("", "Init " + Math.random());
    }

    public List<KhachHang> retriveAllKhachHang() {
        return l;
    }
}

And my jsf page:

<h:form>
                <h1><h:outputText value="List"/></h1>
                <h:dataTable value="#{khachHangMB.retriveAllKhachHang()}" var="item">
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="Idkh"/>
                        </f:facet>
                        <h:outputText value="#{item.idkh}"/>
                    </h:column>
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="TenKH"/>
                        </f:facet>
                        <h:outputText value="#{item.tenKH}"/>
                    </h:column>
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="Cmnd"/>
                        </f:facet>
                        <h:outputText value="#{item.cmnd}"/>
                    </h:column>
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="DiaChi"/>
                        </f:facet>
                        <h:outputText value="#{item.diaChi}"/>
                    </h:column>
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="SoDT"/>
                        </f:facet>
                        <h:outputText value="#{item.soDT}"/>
                    </h:column>
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="Email"/>
                        </f:facet>
                        <h:outputText value="#{item.email}"/>
                    </h:column>
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="MaDuThuong"/>
                        </f:facet>
                        <h:outputText value="#{item.maDuThuong}"/>
                    </h:column>
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="GhiChu"/>
                        </f:facet>
                        <h:outputText value="#{item.ghiChu}"/>
                    </h:column>
                    <h:column>
                        <f:facet name="header">
                            <h:outputText value="MatKhau"/>
                        </f:facet>
                        <h:outputText value="#{item.matKhau}"/>
                    </h:column>
                </h:dataTable>
                <h:commandLink value="Click" action="home" />
            </h:form>

And my faces-config

<navigation-rule>
        <navigation-case>
            <from-outcome>trungthuong_list</from-outcome>
            <to-view-id>/f_trungthuong/trungthuong_list.xhtml</to-view-id>
            <redirect/>
        </navigation-case>
    </navigation-rule>
    <navigation-rule>
        <navigation-case>
            <from-outcome>home</from-outcome>
            <to-view-id>index.xhtml</to-view-id>
            <redirect/>
        </navigation-case>
    </navigation-rule>

I click on command link the random was called but the data on page was not change although i have been edited data on database. Another case, i navigate to other page after that i return but the data is old! Please help me!

[Tim Holloway]

Helpful hint: I normally put my persistence code in a separate persistence service javabean that I inject into the backing bean using Spring. It makes things easier to maintain, since I don't have 2 complex products interacting within the same bean.

I think your primary problem is this:

<h:dataTable value="#{khachHangMB.retriveAllKhachHang()}" var="item">

The value attribute of the dataTable tag should not be a method call, it should be a reference to an object that's either a JSF DataModel class or to an array or Collection that JSF can wrap within a DataModel class.