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Containers and Connectors: Hiding Complexity, Enhancing Portability
The J2EE application model divides enterprise applications into three fundamental parts: components, containers, and connectors. Components are the key focus of application developers, while system vendors implement containers and connectors to conceal complexity and promote portability. Containers intercede between clients and components, providing services transparently to both, including transaction support and resource pooling. Container mediation allows many component behaviors to be specified at deployment time, rather than in program code.
Flexible User Interaction
The J2EE platform provides choices for graphical user interfaces across a company's intranet or on the World Wide Web. Clients can run on desktops, laptops, PDAs, cell phones, and other devices. Pure client-side user interfaces can use standard HTML and Java applets. Support for simple HTML means quicker prototypes, and support for a broader range of clients. Additionally, the J2EE platform supports automatic download of the Java Plug-in to add applet support where it's lacking. The J2EE platform also supports stand-alone Java application clients.
Web Services Interoperability
The Java 2 Platform, Enterprise Edition version 1.4 is the most complete Web services platform ever. The platform features Web services support through the new JAX-RPC 1.1 API, which provides service endpoints based on servlets and enterprise beans. JAX-RPC 1.1 provides interoperability with Web services based on the WSDL and SOAP protocols. The J2EE 1.4 platform also supports the Web Services for J2EE specification, which defines deployment requirements for Web services and utilizes the JAX-RPC programming model. In addition to numerous Web services APIs, the J2EE 1.4 platform also features support for the WS-I Basic Profile 1.0.
Expediting Development and Deployment
Based on these flexible component configurations, the J2EE application model means quicker development, easier customization and greater ability to deploy powerful enterprise applications. And, because it's based on the Java programming language, this model enables all J2EE applications to achieve all the benefits of Java technology: scalability, portability, and programming ease.
Overview of J2EE Features and Services
Java Database Connectivity API
The standard way to connect to a database from a J2EE application or module is through a JDBC driver. Sun ONE Application Server supports the core JDBC 3.0 API and the JDBC 2.0 extensions and works with a wide range of JDBC Compliant™ drivers. A JDBC resource associates a JDBC driver and database to a JNDI name that applications and modules can reference.
Transaction Service
The purpose of a transaction is to ensure that data is updated in an all-or-nothing fashion in order to preserve data integrity. The transaction service provides transactional resource managers for the JDBC API, the JMS API, and resource adapters (connector modules). In the Sun ONE Application Server, you can configure transactions and reference them using the JNDI API.
Java Naming and Directory Interface API
he JNDI API allows application components and clients to look up distributed resources, services, and EJB™ components. The J2EE resources described in this guide are made available through the JNDI API. External JNDI resources and custom resources are also configurable in the Sun ONE Application Server.For information about the JNDI API in the Sun ONE Application Server
Java™ Message Service (JMS) API
The JMS API provides a common way for J2EE applications and modules to create, send, receive, and read messages in a distributed environment. The fully integrated JMS provider for Sun ONE Application Server is the Sun™ Open Net Environment (Sun ONE) Message Queue software. JMS queues, topics, and message destinations are made available through the JNDI API.
JavaMail™ API
The JavaMail API allows J2EE applications to create, send, receive, and read mail messages. The JavaMail API includes support for the IMAP4, POP3, and SMTP mail protocols. JavaMail sessions are made available through the JNDI API.
Extensible Output Caching
ASP.NET makes it easy to specify how long any request should be cached via common HTTP headers. It also has support for caching output within the memory on your web server itself. You can even use Redis or other providers to handle your output caching.