By Nicholas Kassem
The Java 2 Platform, company version, deals company builders a simplified, component-based method of growing functions for either intranets and the web. Created by means of the firm staff of the Java software program workforce at sunlight Microsystems, Designing firm functions with the Java(tm) 2 Platform, company variation describes the applying configurations supported through the J2EE platform and provides sensible directions for settling on the easiest layout for specific wishes. It explores web-based consumers in keeping with Java servlets and Java ServerPages, middle-tier suggestions utilizing firm JavaBeans know-how, and backend connections in keeping with JDBC expertise. It additionally offers safeguard, deployment, transaction administration, and different key concerns for ultra-modern purposes. utilizing either smaller code samples and a full-scale e-commerce instance, this booklet offers concrete instructions to aid with getting to know the positive factors and merits of the J2EE platform. Chapters contain: An creation to the J2EE platform and a number of other eventualities for net and intranet purposes equipped at the J2EE platform An in-depth dialogue of the applied sciences supplied by means of the J2EE platform the best way to create Web-based purposes carried out with Java servlets and JavaServer Pages applied sciences find out how to enforce the center tier of J2EE functions utilizing company JavaBeans part know-how the right way to attach new J2EE purposes to current details platforms utilizing JDBC and different applied sciences A dialogue of packaging and deploying purposes for the J2EE platform info on options, either computerized and programmatic, for coping with transactions An in-depth exploration of the safety beneficial properties supplied via the J2EE platform an entire hands-on instance of an e-commerce application--the Java puppy shop Demo--written utilizing those layout instructions A word list of phrases utilized in discussing the Java 2 Platform, company version and its applied sciences
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Extra resources for Designing Enterprise Applications with Java 2 Enterprise Edition
Component developers can specify the security requirements of a component at the method level, to ensure that only users with appropriate permissions can access specific data operations. While the EJB and Java Servlet APIs both provide mechanisms for building security checks into code, the basic mechanism for matching users with roles (groups of users having specific permissions) is performed entirely at application deployment time. This provides both greater flexibility and better security control.
For example, each SQL statement executed on a JDBC connection has its own transaction. 2 Web Component Transactions Web components (JSP pages and servlets) are not designed to be transactional. Because of this, Application Component Providers should only perform transactional work directly in Web components on a very limited basis. Preferably, an Application Component Provider should delegate transactional work to the appropriate enterprise beans. When an enterprise bean is used to perform transactional work, the enterprise bean or container takes care of properly setting up the transaction.
In summary, the J2EE programming model promotes a model that anticipates growth, encourages component-oriented code reusability, and leverages the strengths of inter-tier communication. It is the tier integration that lies at the heart of the J2EE programming model. 2 illustrates a number of application scenarios that a J2EE product should be capable of supporting. From a J2EE perspective, there is no implicit bias favoring one application scenario over another. However, a J2EE product should not preclude supporting any and all of these scenarios.