Question

我试图从h：selectOneMenu获取Object“Plage”，这就是为什么我创建了一个Converter，它使用dao（hibernate）将String id转换为数据库中存在的Plage对象这是我的xhtml代码：

<h:selectOneMenu id="pays" styleClass="form-control selectpicker" value="#{service.plage}"
           converter="Convert" >
                <f:selectItems value="#{moyen.plages_l}" var="pl" 
                itemValue="#{pl}" itemLabel="plage entre #{pl.min} et #{pl.max}" />

           </h:selectOneMenu>

这里是Converter的代码：

@FacesConverter(value="Convert")
public class PlageConverter implements Converter {

@Autowired
PlageBo plageBo;

@Override
public Object getAsObject(FacesContext arg0, UIComponent arg1, String value) {
    // TODO Auto-generated method stub
    int id = Integer.valueOf(value);
    Plage pl = plageBo.getPlagebyid(id);
    return pl;
}

@Override
public String getAsString(FacesContext arg0, UIComponent arg1,
        Object service) {
    // TODO Auto-generated method stub
    Plage plage_conv = (Plage) service;
    String idAsString = String.valueOf(plage_conv.getId_plage());
    return idAsString;
}


public PlageBo getPlageBo() {
    return plageBo;
}

public void setPlagebo(PlageBo plageBo) {
    this.plageBo = plageBo;
}}

我在Plage类中覆盖了equals（）和haschode（）：公共类Plage实现Serializable {

private int id_plage;
private Double min;
private Double max;
private MoyenPaiement_pays moyenPaiement_pays;
//Getters & Setters 

    @Override
    public boolean equals(Object o) {
        // TODO Auto-generated method stub
        //return super.equals(arg0);
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Plage that = (Plage) o;
        if ( id_plage!=that.id_plage)  return false;    
        if (max != null ? !max.equals(that.max) : that.max != null) return false;
        if (min != null ? !min.equals(that.min) : that.min != null) return false;
        if (!moyenPaiement_pays.equals(that.moyenPaiement_pays))  return false;
        return true;
    }

    @Override
    public int hashCode() {
        // TODO Auto-generated method stub
         int result = max.hashCode();
            result = 31 * result + (min != null ? min.hashCode() : 0);
            return result;
    }

当我尝试在Bean中获取变量plage时我收到了这个错误：

1100: JSF1073 : javax.faces.FacesException intercepté durant le traitement de PROCESS_VALIDATIONS 3 : UIComponent-ClientId=, Message=null
java.util.logging.ErrorManager: 5
java.lang.NullPointerException
    at java.util.PropertyResourceBundle.handleGetObject(Unknown Source)
    at java.util.ResourceBundle.getObject(Unknown Source)
    at java.util.ResourceBundle.getString(Unknown Source)
    at java.util.logging.Formatter.formatMessage(Unknown Source)

从h：selectOneMenu获取对象时为空指针

0 个答案: