Download e-book for kindle: EJB 3.1 Cookbook by Richard M. Reese

By Richard M. Reese

ISBN-10: 1849682380

ISBN-13: 9781849682381

Each one recipe includes step by step directions by means of an research of what was once performed in each one job and different worthwhile info. The ebook is designed that you can learn it bankruptcy through bankruptcy, or examine the checklist of recipes and seek advice from them in no specific order. it really is full of worthwhile screenshots to make your studying even more straightforward. The publication is geared toward Java EE and EJB builders and programmers. Readers could be accustomed to using servlets within the development of an internet software. A operating wisdom of XML is usually fascinating.

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How to do it... Create a Java EE application called JSPExample. It should contain both a JSPExample-ejb and a JSPExample-war module. 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.

We declared a Map variable called properties and assigned to it a new HashMap. The variable was used to initialize the EJBContainer. This container has a property, MODULES, specifying the modules to be used by the container. The Map object's put method was used to assign the location of the directory containing the CapitalApplication's classes. APP_NAME field was used to specify the name of the application. Next, the EJBContainer class's static method, createEJBContainer, was called with the properties variable as an argument.

44 Chapter 1 Next, create a getContextInformation method returning a string. We can use the StringBuilder class to build a string containing context information. There are several SessionContext methods available. The result of these methods is appended to contextInformation variable. toString(); } The simplest way to demonstrate the use of the method is to modify the SalutationServlet. Add the getContextInformation method call after the statement where the getFormalGreeting method is used. getContextInformation() + "

"); Execute the servlet using the URL http://localhost:8080/SalutationApplicationwar/SalutationServlet as illustrated in the following screenshot: How it works...

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EJB 3.1 Cookbook by Richard M. Reese


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