By Greg Barish
Offers the concise roadmap Java builders and internet engineers have to construct high-performance and scalable company internet purposes. choked with basic procedure structure information and balanced with succinct examples for every expertise. Softcover.
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Additional resources for Building Scalable and High-Performance Java Web Applications Using J2EE Technology
Intuitively, it seems that client/server connectivity becomes more complicated. The communication path now consists of client-to-server1-to-server2-to-…-serverN-to-database. This seems like a route that requires more hops, which means more latencies and more chances for error or crashes. That can't be good, can it? YES, if it's done right. Increased Modularization and Component Reusability Having multiple tiers means dividing the work and routing the parts of the problem at hand to independent modules.
Jar (JAR) file, except that it refers to an enterprise Java application archive, not just to a Java application archive. war (WAR) file, which archives files related to servlets and their JSP pages. class files, any related files, and something called a deployment descriptor (more about this in a moment). , utility Java classes), and a deployment descriptor file. To get a feel for what an EJB JAR file looks like, consider a JAR file for a sample EJB called BenefitSession (this EJB will appear in a later example).
For those familiar with directory services, JNDI is the means with which to access such services as LDAP. For most other J2EE developers, JNDI is simply an easy way to manage resources shared by tiers. From a component standpoint, JNDI gives location-independent access to a common application state, or context. The J2EE specification also views the JNDI context as a mechanism for making application components dynamic. Instead of altering the source code for a component, it bases a conditional part of component execution on the values obtained by access to the context.