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MDBs can use dependency injection to acquire references to resources such as JavaMail, EJBs, or other objects. The resources that an MDB tries to acquire and use must be available in the container context or environment context. In the sample use case from Figure 5-5, we talked about creating an e-mail after the message is processed, and sending the order status to the customer via e-mail. In order to do this in the StatusMailer message bean, we need to acquire a JavaMail session so that we can create an e-mail and send it. JavaMail is an API that provides a platformindependent framework for building mail applications. The JavaMail API is available with the Java EE platform. We can acquire a JavaMail session in an MDB using dependency injection. Listing 5-7 shows the completed StatusMailer MDB using dependency injection and the JavaMail API. The @Resource annotation is used to inject a JavaMail session with the name mail/wineappMail, which has been registered as a mail resource in the GlassFish application server. The injected mail session is used to create javax.mail.Message, and the setter methods are used to create the headers and content of the mail message. Finally, the send() method in the javax.mail.Transport class is used to send the created message.

Adding this code prevents any compiler errors. Press Ctrl+F5 to build and show the web site. Once the web site comes up, log in as admin, and click the Time menu choice. Your screen should look like the one shown in Figure 7-23.

package com.apress.ejb3.chapter05; import javax.annotation.Resource; import javax.ejb.ActivationConfigProperty; import javax.jms.Message; import javax.ejb.MessageDriven; import javax.jms.MapMessage; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage;

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Oops! What happened here Before I tell you, I think you should try to figure it out just from this picture. It looks like the WebPunch controls are not inside the module, but all over the page itself. Resize the browser, and everything moves except these controls. It is almost like they are in a fixed position. Aha! All the controls for the WebPunch program are in a fixed position, as evidenced by the position: absolute; style attribute in each control. I mentioned in a previous chapter that when you are starting to create web pages, it is best to start with absolute positioning. Unfortunately, this has come back to bite you. The best way to fix this is to use an HTML table within the control and place each of these WebPunch controls within the table s cells.

Summary

@MessageDriven(activationConfig= { @ActivationConfigProperty(propertyName="destinationName", propertyValue="StatusMessageTopic"), @ActivationConfigProperty(propertyName="destinationType", propertyValue="javax.jms.Topic") }, mappedName="StatusMessageTopic") public class StatusMailerBean implements javax.jms.MessageListener{ @Resource(name="mail/wineappMail" ) private javax.mail.Session ms; public void onMessage(Message message){ try { if (message instanceof MapMessage) { MapMessage orderMessage = (MapMessage)message; String from = orderMessage.getStringProperty("from"); String to = orderMessage.getStringProperty("to"); String subject = orderMessage.getStringProperty("subject"); String content = orderMessage.getStringProperty("content"); javax.mail.Message msg = new MimeMessage(ms); msg.setFrom(new InternetAddress(from)); InternetAddress[] address = {new InternetAddress(to)}; msg.setRecipients(javax.mail.Message.RecipientType.TO, address); msg.setSubject(subject); msg.setSentDate(new java.util.Date()); msg.setContent(content, "text/html"); System.out.println("MDB: Sending Message..."); Transport.send(msg); System.out.println("MDB: Message Sent"); } else { System.out.println("Invalid message "); }

Creating a Table An HTML table is a good fit for arranging the controls in the TimePunch module. If it is done right, the controls will move and resize properly according to the control itself. Now that you ve copied all the WebPunch controls over here, I want you to delete them from this page. You need to add a table and then add the controls one at a time. Right now, your ViewTimePunch.ascx file should have only the following lines in it:

} catch (Exception ex) { ex.printStackTrace(); }

In this appendix, I covered the process for setting up the server and installing Drupal. You re now ready to begin the journey of creating an incredible web site using the Drupal 7 platform!

There will be certain instances in which an application that uses MDBs requires finegrained control. Two life cycle event callbacks are supported for MDBs: PostConstruct PreDestroy The PostConstruct callback occurs before the first message listener method invocation on the bean, and after the container has performed the dependency injection. The PreDestroy callback occurs when the MDB is removed from the pool or destroyed. For example, a PostConstruct callback can be used to initialize some attributes or resources, and a PreDestroy callback can be used to clean up or release the acquired resources. Callback methods defined on an MDB class should have the following signature:

<%@ Control language="vb" Inherits="YourCompany.Modules.TimePunch.ViewTimePunch" CodeFile="ViewTimePunch.ascx.vb" AutoEventWireup="false" Explicit="True" %> <%@ Register TagPrefix="dnn" TagName="Audit" Src="~/controls/ModuleAuditControl.ascx" %>

public void <METHOD> ()

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