Enterprice java
- 1. EnterPrice Java By v.Sakthi Priya ,M.Sc Department of CS & IT, Nadar Saraswathi College of Arts and Science, Theni.
- 2. EnterPrice Java: They are components that can be connected to form a system They can represent data They can represent behavior Usually, EJBs fall into only one of these categories They are typically used in the server tier EJBs can be persisted EJBs can interact with other EJBs
- 3. Advantages: EJBs are reusable components • Can be reused in different parts of the system • Can be packaged into libraries and sold EJBs Can be combined visually using development IDEs • E.g. Visual Age, Visual Café EJBs provide convenient abstractions so it do not require you to write: • Multi-threaded, multiple access code • Database access code (e.g. JDBC) • Network communication code (i.e. it uses RMI) for client/server communication • Network communication code for EJB to EJB communication • Transaction management code EJBs from different businesses can interact easily • This is because of their well-defined interfaces
- 4. 1. Containers where EJBs (and JSPs and servlets) are executed 2.Provide EJB functionality, including: * Persistence through databases (using JDBC) * Transactions (using Java Transaction Service) 3. Can provide advanced features, including: * Load balancing * Database connection pooling 4.Here are the major application servers: * SJS AP, WebLogic (BEA), Internet Application Server or iAS (Oracle), WebSphere (IBM)
- 6. •Authentication : The means by which communicating entities (for example, client and server) prove to one another that they are acting on behalf of specific identities that are authorized for access. •Access control for resources: The means by which interactions with resources are limited to collections of users or programs for the purpose of enforcing integrity, confidentiality, or availability constraints. •Non-repudiation: The means used to prove that a user performed some action such that the user cannot reasonably deny having done so.
- 7. •Data integrity: The means used to prove that information has not been modified by a third party (some entity other than the source of the information). For example, a recipient of data sent over an open network must be able to detect and discard messages that were modified after they were sent. •Confidentiality or Data Privacy: The means used to ensure that information is made available only to users who are authorized to access it. •Auditing: The means used to capture a tamper-resistant record of security related events for the purpose of being able to evaluate the effectiveness of security policies and mechanisms.
- 8. Client Components A Java EE application can be web-based or non-web- based. An application client executes on the client machine for a non-web-based Java EE application, and a web browser downloads web pages and applets to the client machine for a web-based Java EE application. Application Clients An application client runs on a client machine and provides a way for users to handle tasks such as Java EE system or application administration. It typically has a graphical user interface created from Project Swing or Abstract Window Toolkit (AWT) APIs, but a command-line interface is certainly possible. Application clients directly access enterprise beans running in the business tier. However, if the Java EE application client requirements warrant it, an application client can open an HTTP connection to establish communication with a servlet running in the web tier.
- 9. Web Browsers The user's web browser downloads static or dynamic Hypertext Markup Language (HTML), Wireless Markup Language (WML), or Extensible Markup Language (XML) web pages from the web tier. Dynamic web pages are generated by servlets or JSP pages running in the web tier. Applets A web page downloaded from the web tier can include an embedded applet. An applet is a small client application written in the Java programming language that executes in the Java VM installed in the web browser. However, client systems will likely need Java Plug-in and possibly a security policy file so the applet can successfully execute in the web browser. Applets that run in other network-based systems such as handheld devices or car phones can render Wireless Markup Language (WML) pages generated by a JSP page or servlet running on the Java EE server. The WML page is delivered over Wireless Application Protocol (WAP) and the network configuration requires a gateway to translate WAP to HTTP and back again. The gateway translates the WAP request coming from the handheld device to an HTTP request for the Java EE server, and then translates the HTTP server response and WML page to a WAP server response and WML page for display on the handheld device.
- 10. Container Types The deployment process installs Java EE application components in the following types of Java EE containers. The Java EE components and container addressed in this tutorial are shown in Figure 5. 1. An Enterprise JavaBeans (EJB) container manages the execution of all enterprise beans for one Java EE application. Enterprise beans and their container run on the Java EE server. 2. A web container manages the execution of all JSP page and servlet components for one Java EE application. Web components and their container run on the Java EE server. 3. An application client container manages the execution of all application client components for one Java EE application. Application clients and their container run on the client machine. 4. An applet container is the web browser and Java Plug-in combination running on the client machine.
- 11. Java EE Server and Containers
- 12. Scripts Script Description j2ee Start and stop the Java EE server. cloudscape Start and stop the default database. cloudIJ Run the interactive SQL tool. This is an unsupported tool. j2eeadmin Add JDBC drivers, JMS destinations, and connection factories for various resources. keytool Create public and private keys and generate X509 self-signed certificates. realmtool Import certificate files. Add Java EE users to and remove Java EE users from the authentication and authorization list for a Java EE application.
- 13. packager Package Java EE application components into EAR, EJB JAR, application client JAR, and WAR files. verifier Verify that EAR, EJB JAR, application client JAR, and WAR files are well-formed and comply with the Java EE specification. runclient Run a Java EE application client. cleanup Remove all deployed applications from the Java EE server.
- 14. Thank You…