EJB 3.1 Cookbook by Richard M. Reese

By Richard M. Reese

Each one recipe includes step by step directions by way of an research of what was once performed in each one activity and different important info. The ebook is designed that you should learn it bankruptcy through bankruptcy, or examine the record of recipes and consult with them in no specific order. it truly is filled with worthy screenshots to make your studying even more uncomplicated. The publication is geared toward Java EE and EJB builders and programmers. Readers might be acquainted with using servlets within the building of an internet software. A operating wisdom of XML is additionally fascinating.

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Additional info for EJB 3.1 Cookbook

Example text

The queue was used as the argument in the createProducer method. createProducer(queue); Next, a TextMessage was created using the createTextMessage method. A TextMessage is one of several interfaces derived from the Message interface. These JMS interfaces represent different types of messages used within JMS. The setText method assigned a string to be sent. setText(message); The messageProducer then sent the message. send(textMessage); The output was displayed in the log file used by the SalutationMessageBean.

In the JSPExample-ejb module, we will create a remote session bean called ConstantsBean with methods returning common math constants. We will place it in the packt package. jsp from which we will invoke the EJB. The ConstantsBean is a remote stateless session bean. The bean extends a remote interface, ConstantsBeanRemote, which defines the methods of the bean. These methods include getPI and getGoldenRatio both returning a double value. @Remote public interface ConstantsBeanRemote { public double getPI(); public double getGoldenRatio(); } The ConstantsBean implements this interface and is declared as a stateless session bean.

There are three sections of the JSP page referencing and using the bean. The first section declared the reference variable constantsBean. <%! ConstantsBeanRemote constantsBean; %> The second created the initial context and returned a reference to the bean. Notice the global JNDI name was used to locate the bean. printStackTrace(); } %> The last section used both methods of the ConstantsBean. getGoldenRatio() %> 37 Getting Started With EJBs See also The Accessing the session bean using JNDI recipe, discusses the use of JNDI in more detail.

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