Question

提交JSF表单时，我收到以下异常：

Caused by: javax.faces.FacesException: Target model Type is no a Collection or Array 
    at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectManyValuesForModel(MenuRenderer.java:388) [:2.0.3-] 
    at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectManyValue(MenuRenderer.java:125) [:2.0.3-] 
    at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:311) [:2.0.3-] 
    at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1023) [:2.0.3-]     at javax.faces.component.UIInput.validate(UIInput.java:953) [:2.0.3-] 
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1204) [:2.0.3-] 
    at javax.faces.component.UIInput.processValidators(UIInput.java:693) [:2.0.3-] 
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081) [:2.0.3-] 
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081) [:2.0.3-] 
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081) [:2.0.3-] 
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081) [:2.0.3-] 
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081) [:2.0.3-] 
    at javax.faces.component.UIForm.processValidators(UIForm.java:240) [:2.0.3-] 
    at org.ajax4jsf.component.AjaxViewRoot$3.invokeContextCallback(AjaxViewRoot.java:439) [:3.3.1.GA] 
    at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:238) [:3.3.1.GA] 
    at org.ajax4jsf.component.AjaxViewRoot.processValidators(AjaxViewRoot.java:455) [:3.3.1.GA] 
    at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:72) [:2.0.3-]   at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97) [:2.0.3-] 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114) [:2.0.3-] 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308) [:2.0.3-]
    ... 42 more

这是如何引起的？如何解决？

Answer 1

javax.faces.FacesException: Target model Type is no a Collection or Array
    at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectManyValuesForModel(MenuRenderer.java:388)

此异常表示您在视图中有一个UISelectMany组件，例如<h:selectManyMenu>或<h:selectManyListbox>，其值不已绑定到集合或阵列。这个不对。它的值必须绑定到集合（如List<Entity>）或数组（如Entity[]），因为组件可以检索多个提交的值。

这是一个启动示例，说明正确的<h:selectManyMenu>看起来如何，假设您正在使用String类型的项目：

<h:selectManyMenu value="#{bean.selectedItems}">
    <f:selectItems value="#{bean.availableItems}" />
</h:selectManyMenu>
<h:commandButton value="submit" action="#{bean.submit}" />

与

private List<String> selectedItems; // Note: List<String> and thus NOT String!
private List<String> availableItems;

@PostConstruct
public void init() {
    availableItems = Arrays.asList("one", "two", "three", "four", "five");
}

public void submit() {
    System.out.println("Selected items: " + selectedItems);
}

另见：

How to get all the selected values from h:selectManyListbox in the backend bean in case of JSF?

Answer 2

我的解决方案是：我从RadioButton brown = new RadioButton("Brown "); Color color = Color.valueOf(brown.getText().trim());标记的标记display: none中删除了属性“ dtSubItem”，所有正常工作。命令按钮正在提交有关Submit事件的数据表。

处理第一个请求，但第二个错误是在填充数据表时出现的。

process

javax.faces.FacesException：目标模型Type不是Collection或Array

2 个答案:

另见：