Implementing and configuring the managed bean

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In this example, the JSF application needs a managed bean to accomplish the following tasks:

Loading the IVL file when the Web application starts
Creating a manager view in order to display the graphic view.

Implementing the managed bean

To create the Java implementation file:

In the Package Explorer view, right-click the src folder and select New>Class.
Enter SupportBean in the Name field and click Finish.

Open the newly created file SupportBean.java located in the src folder and implement the SupportBean class as follows:

import ilog.views.IlvManager;
import ilog.views.IlvManagerView;
import java.net.URL;
import javax.faces.context.FacesContext;

public class SupportBean {

	private IlvManagerView managerView;

	public SupportBean() {
		initManagerView();
	}

	/**
	 * Initializes the manager view with the current ivl file.
	 */
	protected void initManagerView() {
		if (managerView == null) 
			managerView = new IlvManagerView();
		URL ivlURL;
		try {
			ivlURL = FacesContext.getCurrentInstance().getExternalContext().getResource("/java2d.ivl");      
			IlvManager manager = managerView.getManager();
			manager.setFileName(ivlURL);
			managerView.fitTransformerToContent();
			managerView.setKeepingAspectRatio(true);  
		} catch (Exception e) {
			e.printStackTrace();
		}    
	}

	/**
	 * Returns the manager view.
	 * @return The manager view.
	 */
	public IlvManagerView getView() {
		return managerView;
	}
}

The SupportBean class loads the file java2d.ivl located in the root folder of the Web application and creates a manager view for this file.

Configuring the managed bean

You must now declare this class as a managed bean so that it can be accessed by JViews JSF components.

To declare the class as a managed bean:

Open the file faces-config.xml located in the WebContent/WEB_INF folder and add the code shown in bold in the following code example:

<?xml version="1.0" encoding="UTF-8"?>

<faces-config
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"
    version="1.2">
    
<managed-bean>
    <managed-bean-name>support</managed-bean-name>
    <managed-bean-class>SupportBean</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
  </managed-bean>

</faces-config>

You have now implemented and configured the managed bean.

Current section

Getting started with a basic JViews JSF application