Initializing Maps and Lists

In addition to configuring Map and List properties, you can also configure a Map and a List directly so that you can reference them from a tag rather than referencing a property that wraps a Map or a List.

The Duke’s Bookstore application configures a List to initialize the list of free newsletters, from which users can choose a set of newsletters to subscribe to on the bookcashier.jsp page:

<managed-bean>
    ...
<managed-bean-name>newsletters</managed-bean-name>
    <managed-bean-class>
        java.util.ArrayList
    </managed-bean-class>
    <managed-bean-scope>application</managed-bean-scope>
    <list-entries>
        <value-class>javax.faces.model.SelectItem</value-class>
        <value>#{newsletter0}</value>
        <value>#{newsletter1}</value>
        <value>#{newsletter2}</value>
        <value>#{newsletter3}</value>
    </list-entries>
</managed-bean>
<managed-bean>
    <managed-bean-name>newsletter0</managed-bean-name>
    <managed-bean-class>
        javax.faces.model.SelectItem
    </managed-bean-class>
    <managed-bean-scope>none</managed-bean-scope>
    <managed-property>
        <property-name>label</property-name>
        <value>Duke’s Quarterly</value>
    </managed-property>
    <managed-property>
        <property-name>value</property-name>
        <value>200</value>
    </managed-property>
</managed-bean>
...

This configuration initializes a List called newsletters. This list is composed of SelectItem instances, which are also managed beans. See Using the selectItem Tag for more information on SelectItem. Note that, unlike the example in Initializing Map Properties, the newsletters list is not a property on a managed bean. (It is not wrapped with a managed-property element.) Instead, the list is the managed bean.