primefaces datatable sorunu

Merhaba. Primefaces ile datatable kullanirken anlamadigim olaylar oluyor.Ben projeyi refresh yaparken aynı(listEmpDetail ) method 2 kez calisiyor.Datatablenin rowSelection özelliğini kullandığım zaman ise listEmpDetail methodu defalarca çalışıyor ,halbuki o methodun çalışmaması gerek.Projeye bu linkden ulaşa bilirsiniz : LINK

Yardımcı olursanız sevinirim.Teşekkürler Kaynak kod :

<h:form id="fsearch">
        <p:growl id="growl5" showDetail="true" life="10000" />

        <p:dataTable var="e"  value="#{ec.employee}" 
                     id="dypdatatable" scrollable="true"  scrollHeight="600" scrollWidth="1500"
                     selection="#{ec.selectedEmp}" selectionMode="single" rowKey="#{e.id}"

                     >

            <f:facet name="header" >
                List of Employee
            </f:facet>
            <p:ajax event="rowSelect" listener="#{ec.onRowSelect}" update=":fsearch:growl5" />

            <p:column headerText="Id" style="width:50px;" filterStyle="width: 45px;" filterBy="#{e.id}" sortBy="#{e.id}">
                <h:outputText value="#{e.id}"  />
            </p:column>
            <p:column headerText="Name" style="width:350px;" filterStyle="width: 345px;" filterBy="#{e.name}" sortBy="#{e.name}">
                <h:outputText value="#{e.name}"  />
            </p:column>
            <p:column headerText="Surname" style="width:60px;" filterStyle="width: 55px;" filterBy="#{e.surname}" sortBy="#{e.surname}">
                <h:outputText value="#{e.surname}" />
            </p:column>
            <p:column headerText=" Country" style="width:60px;" filterStyle="width: 35px;" filterBy="#{e.country}" sortBy="#{e.country}">
                <h:outputText value="#{e.country}" />
            </p:column>
            <p:column headerText="City" style="width:30px;" filterStyle="width: 25px;" filterBy="#{e.city}" sortBy="#{e.city}">
                <h:outputText value="#{e.city}" />
            </p:column>
        </p:dataTable>

    </h:form>

Database işləmi :

public List<empdetail> listEmpDetail() { try { System.out.println("listEmpDetail girir connect olmayib - "+new Date()); connection();

        System.out.println("listEmpDetail girir - "+new Date());
        System.out.println();
        String sql = "SELECT * from  emp_detail";
        System.out.println(sql+"-"+new Date());
        psmt = connection.prepareStatement(sql);
        resultSet = psmt.executeQuery();

        resultSet.last();
        System.out.println(resultSet.getRow()+" - "+new Date());
        resultSet.first();
        System.out.println(resultSet.getRow()+" - "+new Date());
        List<EmpDetail> data = new ArrayList<EmpDetail>();
        while (resultSet.next()) {
            EmpDetail p = new EmpDetail();
            p.setId(resultSet.getInt(1));
            p.setName(resultSet.getString(2));
            p.setSurname(resultSet.getString(3));
            p.setCountry(resultSet.getString(4));
            p.setCity(resultSet.getString(5));
            data.add(p);
        }
        System.out.println("listEmpDetail return - "+new Date());
        return data;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        close();
    }
}

Managed Bean :

@ManagedBean(name = "ec") @javax.faces.bean.SessionScoped public class EmployeeController implements Serializable {

 private List<EmpDetail> employee= new ArrayList<EmpDetail>();
private DbSQL db = new DbSQL();

private EmpDetail selectedEmp;

public EmployeeController() {
}

public List<EmpDetail> getEmployee() {
    employee = db.listEmpDetail();
    return employee;
}

public void setEmployee(List<EmpDetail> employee) {
    this.employee = employee;
}

public EmpDetail getSelectedEmp() {
    return selectedEmp;
}

public void setSelectedEmp(EmpDetail selectedEmp) {
    this.selectedEmp = selectedEmp;
}

    public void onRowSelect(SelectEvent event) {
    System.out.println("----- Secilenenin Idsi : "+String.valueOf(((EmpDetail) event.getObject()).getId())+"--------");
    FacesMessage msg = new FacesMessage("Employee Selected", String.valueOf(((EmpDetail) event.getObject()).getId()));
    FacesContext.getCurrentInstance().addMessage(null, msg);
}
public void onRowUnselect(UnselectEvent event) {
    System.out.println("----- Secilenenin Idsi : "+String.valueOf(((EmpDetail) event.getObject()).getId())+"--------");
    FacesMessage msg = new FacesMessage("EmpDetail UNSelected", String.valueOf(((EmpDetail) event.getObject()).getId()));
    FacesContext.getCurrentInstance().addMessage(null, msg);
}

}