JSF列表<Class>是空

Question

好吧，标题不是很好，但我无法找到一个更好的...

在java中

我有一个类型类的一些性质和另一种类型的列表...

在HTML中我有一个表，其中每行是上述列表中的一个元素，我可以成功获取每行的属性，但是当我提交表单时List是空的/ null

这是我的代码：

TESTATA

package rip; 

import java.util.ArrayList; 
import java.util.Date; 
import java.util.List; 

import javax.faces.application.FacesMessage; 
import javax.faces.bean.ManagedBean; 
import javax.faces.context.FacesContext; 

@ManagedBean 
public class Testata { 
    private String codice = "asd"; // set up for test 
    private String descrizione = "descrizione"; // set up for test 
    private Date data_inizio = new Date(); // set up for test 
    private Date data_fine = new Date(); // set up for teset 

    private List<Righe> righe; 


    public Testata() 
    { // set up righe for test 
      righe = new ArrayList<Righe>(); 
      righe.add(new Righe("001", "descrizione riga 1", "G", true)); 
      righe.add(new Righe("002", "descrizione riga 2", "G", false)); 
      righe.add(new Righe("003", "descrizione riga 3", "P", false)); 
    } 

     // base setter/getter 
    public List<Righe> getRighe() { 
     return (righe); 
    } 
    public void setRighe(List<Righe> righe) { 
     System.out.println("Set Righe"); // used for debug, in my tests 
              // it was never printed 
     this.righe = righe; 
    } 

    public String validateSecond() 
    { 
     if (righe != null) 
     { 
      for (int i = 0 ; i < righe.size() ; i++) 
      { 
       System.out.println(righe.get(i).getCodice()); 
      } 
     } 
     else 
     { 
      System.out.println("Righe is null"); // usually submitting the 
             // form I got this message in console 
     } 
     return null; 
    } 

RIGHE

public class Righe { 

    private String codice; 
    private String descrizione; 
    private String tipo; 
    private Boolean YESNO;  

    private static String [] codiceLists = {"001","002","003","004","005","006","007","008"}; 
    private static String [] descrizioneLists = {"desc 001","desc 002","desc 003","desc 004","desc 005","desc 06","desc 007","desc 008"}; 
    private static String [] tipoLists = {"P", "G"}; 

// getter/setter 

    // getter for static lists 

public String [] getCodiceLists() { 
    return codiceLists; 
} 

public String [] getDescrizioneLists() { 
    return descrizioneLists; 
} 

righe.xhtml

<h:form id="form_righe">       
    <h:dataTable var="righe" styleClass="table_dettaglio" 
     rowClasses="table_dettaglio_row"    
      value="#{testata.righe}"    
      columnClasses="column_generic,column_generic,tipo_column,column_generic,column_generic"    
      >    
       <h:column> 
        <f:facet name="header">Codice</f:facet>           
        <rich:select id="codice" enableManualInput="false" value="#{righe.codice}"> 
          <f:selectItems value="#{righe.codiceLists}" /> 
          <a4j:ajax event="selectitem" render="@form" execute="@this"/> 
       </rich:select>      
       </h:column>   
       <h:column> 
        <f:facet name="header">Descrizione</f:facet>       
        <rich:select enableManualInput="true" id="descrizione"       
          defaultLabel="#{righe.descrizione}"> 
          <f:selectItems value="#{righe.descrizioneLists}" /> 
       </rich:select> 
       </h:column>  
       <h:column> 
       <h:outputStylesheet> 
        .mySelectStyle input{ 
        width: 100px; 
       }</h:outputStylesheet> 
        <f:facet name="header">Tipo</f:facet>      
        <rich:select enableManualInput="false"         
         styleClass="mySelectStyle"       
        defaultLabel="#{righe.tipo}"> 
        <f:selectItems value="#{righe.tipoLists}" /> 
        </rich:select> 
       </h:column>   
       <h:column> 
        <f:facet name="header">Valore</f:facet> 
        <h:inputText value="#{rige.valore}" style="width: 150px;"/>      
       </h:column> 

       <h:column> 
        <f:facet name="header">YesNo?</f:facet> 
        <h:selectOneRadio id="flag_medico" value="#{righe.flag_medico}" layout="pageDirection"         
           styleClass="radio_check"/> 

       </h:column> 
      </h:dataTable>       
     <h:commandButton class="button btn btn-warining btn-large" action="#{testata.validateSecond}" 
             value="Salva" /> 
     <h:commandButton type="reset" class="button btn btn-warining btn-large" value="Pulisci"/> 
    </div> 
</h:form> 

打开网页，我把所有的行正确DISP奠定了每个领域的正确价值..在validateSecond方法提交后，我得到一个空List<Righe> 我错过了什么？

谢谢

Answer 1

尝试增加@ViewScoped或@SessionScoped（取决于你的需要）到你的托管bean，原因不在于标注默认将@NoneScoped

当与数据表工作的更常见的工作至少@ViewScoped

看看这个The benefits and pitfalls of @ViewScoped - BalusC