EJB FILETYPE PDF

In this tutorial, we learn how to use Enterprise JavaBeans. Enterprise JavaBean EJB is a server-side component that encapsulates the business logic of an application. EJBs are run in an EJB container, which is responsible for various system-level services, including transaction management, security, and concurrency control. We will run our examples in GlassFish. Apache Derby is an open source relational database implemented entirely in Java.

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Using Converters, Listeners, and Validators. Developing with JavaServer Faces Technology. Composite Components: Advanced Topics and Example. Configuring JavaServer Faces Applications. Uploading Files with Java Servlet Technology. Internationalizing and Localizing Web Applications. Using the Embedded Enterprise Bean Container. Getting Started Securing Web Applications.

Getting Started Securing Enterprise Applications. Specifying an Authentication Mechanism and Secure Connection. Securing an Enterprise Bean Programmatically. Configuring a Component's Propagated Security Identity.

The following examples show how to secure enterprise beans using declarative and programmatic security. When a bean that is constrained in this way is requested, the server requests a user name and password from the client and verifies that the user name and password are valid by comparing them against a database of authorized users on the GlassFish Server. If the topic of authentication is new to you, see Specifying Authentication Mechanisms.

In the example application included with this tutorial, these steps have been completed for you and are listed here simply to show what needs to be done should you wish to create a similar application.

Create an application like the one in The cart Example. The example in this tutorial starts with this example and demonstrates adding basic authentication of the client to this application.

If you have not already done so, complete the steps in To Set Up Your System for Running the Security Examples to configure your system for running the tutorial applications. Modify the source code for the enterprise bean, CartBean. This step is discussed in Annotating the Bean. The source code for the original cart application was modified as shown in the following code snippet modifications in bold. The RolesAllowed annotation is specified on methods for which you want to restrict access.

In this example, only users in the role of TutorialUser will be allowed to add and remove books from the cart and to list the contents of the cart. A RolesAllowed annotation implicitly declares a role that will be referenced in the application; therefore, no DeclareRoles annotation is required.

The presence of the RolesAllowed annotation also implicitly declares that authentication will be required for a user to access these methods. This step builds and packages the application into cart-secure. If the user name and password you enter are authenticated, the output of the application client appears in the Output pane:.

If the user name and password are not authenticated, the dialog box reappears until you type correct values. This example demonstrates how to use the getCallerPrincipal and isCallerInRole methods with an enterprise bean. This example starts with a very simple EJB application, converter , and modifies the methods of the ConverterBean so that currency conversion will occur only when the requester is in the role of TutorialUser. This section builds on the example by adding the necessary elements to secure the application by using the getCallerPrincipal and isCallerInRole methods, which are discussed in more detail in Accessing an Enterprise Bean Caller's Security Context.

In general, the following steps are necessary when using the getCallerPrincipal and isCallerInRole methods with an enterprise bean. In the example application included with this tutorial, many of these steps have been completed for you and are listed here simply to show what needs to be done should you wish to create a similar application.

Set up a user on the GlassFish Server in the file realm, in the group TutorialUser , and set up default principal to role mapping. If the application contains a web client that is a servlet, specify security for the servlet, as described in Specifying Security for Basic Authentication Using Annotations.

The source code for the original ConverterBean class was modified to add the if.. If the user is in the correct role, the currency conversion is computed and displayed. If the user is not in the correct role, the computation is not performed, and the application displays the result as 0.

The following annotations specify security for the converter web client, ConverterServlet :. All rights reserved. Legal Notices. The Java EE 6 Tutorial. Examples: Securing Enterprise Beans The following examples show how to secure enterprise beans using declarative and programmatic security. Annotating the Bean The source code for the original cart application was modified as shown in the following code snippet modifications in bold. The code snippet is as follows: package cart.

BookException; import cart. IdVerifier; import java. ArrayList; import java. List; import javax. Remove; import javax. Stateful; import javax. DeclareRoles; import javax. Click Open Project. In the Projects tab, right-click the cart-secure project and select Build. In the Projects tab, right-click the cart-secure project and select Deploy.

To run the application client, right-click the cart-secure project and select Run. A Login for user: dialog box appears. In the dialog box, type the user name and password of a file realm user created on the GlassFish Server and assigned to the group TutorialUser ; then click OK. If the user name and password you enter are authenticated, the output of the application client appears in the Output pane Caught a BookException: "Gravity's Rainbow" not in cart.

Java Result: If the user name and password are authenticated, the client displays the following output: [echo] running application client container. Create a simple enterprise bean application. Build, package, deploy, and run the application. Modifying ConverterBean The source code for the original ConverterBean class was modified to add the if.. The code snippet with modifications shown in bold is as follows: package converter.

BigDecimal; import javax. Stateless; import java. Principal; import javax. Resource; import javax. SessionContext; import javax. Select the Open as Main Project check box. Right-click the converter-secure project and select Build. Right-click the converter-secure project and select Deploy. Type a user name and password combination that corresponds to a user who has already been created in the file realm of the GlassFish Server and has been assigned to the group of TutorialUser ; then click OK.

Type in the input field and click Submit. A second page appears, showing the converted values. Overview 2. Getting Started with Web Applications 4. JavaServer Faces Technology 5. Introduction to Facelets 6. Expression Language 7. Using Converters, Listeners, and Validators 9. Developing with JavaServer Faces Technology Composite Components: Advanced Topics and Example Configuring JavaServer Faces Applications Java Servlet Technology Uploading Files with Java Servlet Technology Introduction to Web Services Enterprise Beans Getting Started with Enterprise Beans Running the Enterprise Bean Examples A Message-Driven Bean Example Using the Embedded Enterprise Bean Container Running the Persistence Examples The Java Persistence Query Language Getting Started Securing Web Applications Transactions

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Creating an Enterprise Application with EJB 3.1

Using Converters, Listeners, and Validators. Developing with JavaServer Faces Technology. Composite Components: Advanced Topics and Example. Configuring JavaServer Faces Applications. Uploading Files with Java Servlet Technology. Internationalizing and Localizing Web Applications. Using the Embedded Enterprise Bean Container.

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