J2EE: An enterprise Java blueprint
IN TODAY'S competitive marketplace, organizations are facing the difficult
challenge of providing a broad range of electronic-business services while keeping
costs down in the face of ever-compressed development cycles. To address this problem,
many companies are investigating the implementation of business logic on the midtier
using Java. Those who use Java components often find that development is simplified and
that rapid deployment is achievable. What's more, distributed Java applications can be
implemented in such a manner as to boost scalability and reliability.
In the past, companies choosing Java have struggled with security-and performance-
related issues. For many sites, these problems have detracted from Java's overall value
within the enterprise. Sun Microsystems has thoroughly invested itself in addressing
these challenges. The result, released this month, is Sun's Java 2 Enterprise Edition
(J2EE) software developer's kit (SDK).
J2EE is a standard architecture definition using the Java language, which companies
can now more readily leverage on the midtier to speed up distributed deployments. The
use of this architecture in enterprise development efforts allows developers to quit
worrying about the "plumbing" required to run mission-critical business applications
and instead focus on designing the business logic and presentation of applications.
There are several components that make up Sun's J2EE, including an application
programming model, a standard platform for implementation, a compatibility suite to
test compliance, and a reference implementation. Building on the features that Sun
included in its Java 2 Standard Edition, this latest release of J2EE boosts scalability
while adeptly tackling the performance and security issues that have plagued Java. Sun
has added full support for Enterprise JavaBeans (EJB), the Java servlets API, and Java
Server Pages (JSP). The net of this is an architecture that can significantly reduce
time to market for enterprise developers.
The J2EE Model
Anyone tasked with creating highly available and reliable buusiness applications
knows how complex the job can be. The bulk of the development time and expense often
comes from having to build the midtier plumbing required for accessing and managing
data and applications from a variety of enterprise resources.
J2EE's Application Programming Model, also called the J2EE BluePrints, alleviates
some of that complexity by providing an architectural model comprising an integrated
set of documentation and examples for implementing J2EE-based multitier applications.
It is meant to be used as a guideline for developers to design and optimize components,
to strategically divide development labor, and to allocate technology resources.
Following the model will ensure that one J2EE application will function just like
another.
The J2EE Application Programming Model instructs developers to partition their work
into two distinct categories: business logic and presentation logic. The rest is
handled automatically by the system resources. Without the requirement to code midtier
plumbing,
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