Building a Web Page Using a Managed Bean

After you create a Web application project, you can add Web pages. Use a managed bean to provide data and actions for the Web page. The data comes from managed bean properties, and the actions come from managed bean methods.

1. Create a managed bean.
2. Create a Web page.
3. In the Data Bindings view, Drag and drop the managed bean you want to use onto the Web page. The Create JSF Components wizard opens.
4. To map the managed bean attributes to JSF components:
   1. Unselect attributes that you do not want to map.
   2. Edit a JSF component by clicking in its cell, clicking the down arrow, and selecting a new JSF component.
   3. Edit the text in the Label column to the appropriate name for each member.
   4. To change an attribute mapping, select the attribute and click Move Up or Move Down.
   5. Click:
      
      • Next to configure a container to hold the new components.
      • Finish to accept the defaults and skip the rest of this procedure.
5. On the Configure a Container to Hold the Generated Components page:

   Option	Action
   Use a table-type container	Select Use Table-Typed container to Hold Components. Select either a JSF panelGrid or an HTML Table. Type the number of component pairs that you want to appear in each row.
   Do not use a container	Select Do Not Use Container.

6. Click Next. The generated code from your selections displays.
7. Click Finish. The Web page with your selections is generated.
8. Select File > Save from the main menu bar to save the Web page.
9. (Optional) Click the Preview tab.

• Binding a Managed Bean to a Control
  After you create a managed bean, you must bind the managed bean, or a method or property of the managed bean, to a component on a JavaServer Faces (JSF) Web page. A managed bean property provides data for the Web page, and a managed bean method binds logic to a component.
• Configuring a Managed Bean
  Configure a Java, Service, DataWindow, or EJB managed bean by editing the faces-config.xml file.
• Changing Managed Bean Properties
  Change managed bean properties, for example the datatype, and add new properties to the managed bean, for example, a new datatype. manually change the Java file using the Eclipse Java Source editor.
• Managed Bean Initialization
  A managed bean is initialized automatically by JavaServer Faces (JSF) at runtime, but a complex property type in a managed bean may not initialize. If a property is not initialized, a NullPointerException is thrown.
• Deleting a Managed Bean
  Delete a managed bean from its data binding.

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