Question

我在 faces-config.xml

中有一个映射的bean

<managed-bean>
  <managed-bean-name>beanName</managed-bean-name>
  <managed-bean-class>java.util.HashMap</managed-bean-class>
  <managed-bean-scope>view</managed-bean-scope>
  <managed-property>
   <property-name>elements</property-name>
   <map-entries>
    <key-class>java.lang.String</key-class>
    <value-class>path.InputFormElementContainer</value-class>
   </map-entries>
  </managed-property>
 </managed-bean>

java中的实现是：

public class InputFormElementContainer implements List<InputFormElement>, Serializable{


    private static final long serialVersionUID = -4685106549564090233L;
    private List<InputFormElement> elements;

    //Empty Constructor
    public InputFormElementContainer() {
        elements = new ArrayList<InputFormElement>();
    }
    public List<InputFormElement> getElements() {
        return elements;
    }
    public void setElements(List<InputFormElement> elements) {
        this.elements = elements;
    }
}

但是当我刷新我的应用程序时，我收到了这个错误：

com.sun.faces.mgbean.ManagedBeanCreationException: No se puede crear el bean administrado beanName.  Se han encontrado los problemas siguientes:
     - No existe la propiedad elements para el bean administrado beanName.

对英语的翻译可能是：由于以下问题，无法创建管理的beanName：beanName不存在elemts属性。

迁移到JSF2时遇到了这个问题。我正在阅读教程，但我无法弄清楚如何在JSF2中正确地创建这个manage-bean。有人能帮助我吗？提前谢谢！

Answer 1

这是错误的

<managed-bean-name>beanName</managed-bean-name>
  <managed-bean-class>java.util.HashMap</managed-bean-class>
  <managed-bean-scope>view</managed-bean-scope>
  <managed-property>
   <property-name>elements</property-name>

此处jsf将搜索java.util.HashMap中不存在的字段elements的getter / setter，因此错误

Answer 2

根据您对InputFormElementContainer类的建模方式，您有两种选择

如果您需要'elements'作为List：

<managed-bean>
  <managed-bean-name>beanName</managed-bean-name>
  <managed-bean-class>java.util.HashMap</managed-bean-class>
  <managed-bean-scope>view</managed-bean-scope>
  <managed-property>
    <property-name>elements</property-name>
    <property-class>java.util.ArrayList</property-class>
    <list-entries>
      <value-class>path.InputFormElementContainer</value-class>
      <value>...</value
      ...
    </list-entries>
  </managed-property>
</managed-bean>

或者如果您需要'elements'属性作为Map：

<managed-bean>
      <managed-bean-name>beanName</managed-bean-name>
      <managed-bean-class>java.util.HashMap</managed-bean-class>
      <managed-bean-scope>view</managed-bean-scope>
      <managed-property>
        <property-name>elements</property-name>
        <property-class>java.util.HashMap</property-class>
        <map-entries>
          <key-class>java.lang.String</key-class>
          <value-class>path.InputFormElementContainer</value-class>
          <map-entry>
            <key></key>
            <value></value>
          </map-entry>
        </map-entries>
      </managed-property>
    </managed-bean>

jsf2 + <managed-property> <property-name> </property-name> </managed-property>

2 个答案: