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<SelectItem> getAllTSs() { allTSs = new ArrayList<SelectItem>(); List<CoalTransportStyle> 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 /** * <p>Return <code>true</code> if the specified value matches one of the * available options, performing a recursive search if if a * {@link SelectItemGroup} instance is detected.</p> * * @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.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; } }