JSF Validation Error: Value is not valid错误

问题提出：

平台：Richfaces,Jsf,Spring,Ejb3.0

• 页面文件:

<h:selectOneListbox size="1"

    value="#{coalDailyBackBean.currentEntity.coalDaily.coalTS}" converter="com.mycompany.CoalTransportStyleConverter">

    <f:selectItems value="#{coalDailyBackBean.allTSs}">

    f:selectItems>

h:selectOneListbox>

    coalTS是一个CoalTransportStyle的对象

    allTSs是一个CoalTransportStyle的List

 

•  JSF配置文件faces-config.xml:

<converter>

    <converter-id>

        com.mycompany.CoalTransportStyleConverter

    converter-id>

    <converter-class>     com.mycompany

.parameter.plantinfo.web.converter.CoalTransportStyleConverter

    converter-class>

converter>

    CoalTransportStyle.java

@Entity

@Table(name = "T_CoalTransportStyle")

public class CoalTransportStyle implements Serializable {



    /**

     *

     */

    private static final long serialVersionUID = -5090574246490412429L;

    private Long id;

    private String paraName;

    @Id

    @GeneratedValue(strategy=GenerationType.AUTO)

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    @Column(unique=true,nullable=false)

    public String getParaName() {

        return paraName;

    }

    public void setParaName(String paraName) {

        this.paraName = paraName;

    }

}

 

public class CoalTransportStyleConverter implements Converter {

    public Object getAsObject(FacesContext arg0, UIComponent arg1, String arg2) {

        CoalTransportStyle style = new CoalTransportStyle();

        String strs[] = arg2.split(":");

        style.setId(new Long(strs[0]));

        style.setParaName(strs[1]);

        return style;

    }



    public String getAsString(FacesContext arg0, UIComponent arg1, Object arg2) {

        CoalTransportStyle style = (CoalTransportStyle) arg2;

        return style.getId() + ":" + style.getParaName();

    }

}

 

   定义了一个converter

• 后台支撑Bean:
  

  /**
  
   * 获得所有的运输方式
  
   *
  
   * @return the allTSs
  
   */
  
  public List getAllTSs() {
  
      allTSs = new ArrayList();
  
      List list = coalTransportStyleService.queryAll(
  
              "paraName", true);
  
      for (CoalTransportStyle style : list) {
  
          allTSs.add(new SelectItem(style, style.getParaName()));
  
      }
  
      return allTSs;
  
  }

   

  /**
  
   * @return the currentEntity
  
   */
  
  public CoalDailyEntity getCurrentEntity() {
  
      if (getCoalDailyId() != null) {
  
          currentEntity = new CoalDailyEntity();
  
          currentEntity.setPlant(plant);
  
          currentEntity.setT_Date(date);// 设置时间
  
          currentEntity.setCoalDaily(coal);
  
      }
  
      return currentEntity;
  
  }

   初始页面显示时，h:selectOneListbox显示没有问题,但是当数据提交时，就报了一个错：Validation Error: Value is not valid　上网找了半天也没找到答案，后来自己调试了一下。
• 当数据提交时，是调用了CoalTransportStyleConverter的getAsObject说明这个对象已经创建起来了。但是为什么还报这个错误呢？
• 于是我找了Messages_en.properties错误信息文件。

  javax.faces.component.UISelectOne.INVALID={0}: Validation Error: Value is not valid

• 又找到UISelectOne的validateValue方法。

  protected void validateValue(FacesContext context, Object value) {
  
  
  
          // Skip validation if it is not necessary
  
          super.validateValue(context, value);
  
  
  
          if (!isValid() || (value == null)) {
  
              return;
  
          }
  
  
  
          // Ensure that the value matches one of the available options
  
          boolean found = matchValue(value, new SelectItemsIterator(this));
  
  
  
          // Enqueue an error message if an invalid value was specified
  
          if (!found) {
  
              FacesMessage message =
  
                  MessageFactory.getMessage(context, INVALID_MESSAGE_ID,
  
                       MessageFactory.getLabel(context, this));
  
              context.addMessage(getClientId(context), message);
  
              setValid(false);
  
          }
  
      }
  
  
  
  
  
      // --------------------------------------------------------- Private Methods
  
  
  
  
  
      /**
  
       * Return true if the specified value matches one of the
  
       * available options, performing a recursive search if if a
  
       * {@link SelectItemGroup} instance is detected.
  
       *
  
       * @param value {@link UIComponent} value to be tested
  
       * @param items Iterator over the {@link SelectItem}s to be checked
  
       */
  
      private boolean matchValue(Object value, Iterator items) {
  
  
  
          while (items.hasNext()) {
  
              SelectItem item = (SelectItem) items.next();
  
              if (item instanceof SelectItemGroup) {
  
                  SelectItem subitems[] =
  
                      ((SelectItemGroup) item).getSelectItems();
  
                  if ((subitems != null) && (subitems.length > 0)) {
  
                      if (matchValue(value, new ArrayIterator(subitems))) {
  
                          return (true);
  
                      }
  
                  }
  
              } else {
  
                  //Coerce the item value type before comparing values.
  
                  Class type = value.getClass();
  
                  Object newValue;
  
                  try {
  
                      newValue = getFacesContext().getApplication().
  
                          getExpressionFactory().coerceToType(item.getValue(), type);
  
                  } catch (ELException ele) {
  
                      newValue = item.getValue();
  
                  } catch (IllegalArgumentException iae) {
  
                      // If coerceToType fails, per the docs it should throw
  
                      // an ELException, however, GF 9.0 and 9.0u1 will throw
  
                      // an IllegalArgumentException instead (see GF issue 1527).
  
                      newValue = item.getValue();
  
                  }
  
                  if (value."color: #ff0000;">equals
  (newValue)) {
  
                      return (true);
  
                  }
  
              }
  
          }
  
          return (false);
  
  
  
      }

   这里调用了equals方法，结果是不行，所以抛出了这个异常。
• 重写CoalTransportStype的equals方法即可:

  @Entity
  
  @Table(name = "T_CoalTransportStyle")
  
  public class CoalTransportStyle implements Serializable {
  
  
  
      /**
  
       *
  
       */
  
      private static final long serialVersionUID = -5090574246490412429L;
  
      private Long id;
  
      private String paraName;
  
      @Id
  
      @GeneratedValue(strategy=GenerationType.AUTO)
  
      public Long getId() {
  
          return id;
  
      }
  
      public void setId(Long id) {
  
          this.id = id;
  
      }
  
      @Column(unique=true,nullable=false)
  
      public String getParaName() {
  
          return paraName;
  
      }
  
      public void setParaName(String paraName) {
  
          this.paraName = paraName;
  
      }
  
  
  
      public boolean equals(Object obj) {
  
          if (this == obj)
  
              return true;
  
          if (obj == null)
  
              return false;
  
          if (getClass() != obj.getClass())
  
              return false;
  
          final CoalTransportStyle other = (CoalTransportStyle) obj;
  
          if (id == null) {
  
              if (other.id != null)
  
                  return false;
  
          } else if (!id.equals(other.id))
  
              return false;
  
          if (paraName == null) {
  
              if (other.paraName != null)
  
                  return false;
  
          } else if (!paraName.equals(other.paraName))
  
              return false;
  
          return true;
  
      }
  
  }