J2EE, or the Java 2 Platform, Enterprise Edition, is a standard
for development of enterprise applications based on reusable components in
a multi-tier environment. In addition to the features of the Java 2 Platform,
Standard Edition (J2SE), J2EE adds support for Enterprise Java Beans (EJBs),
Java Server Pages (JSPs), Servlets, XML and many more. The J2EE architecture
is used to bring together existing technologies and enterprise applications
in a single, manageable environment.
Derby is a J2EE-conformant
component in a distributed J2EE system. As such, it is one part of a larger
system that includes, among other things, a JNDI server, a connection pool
module, a transaction manager, a resource manager, and user applications.
Within this system, Derby can
serve as the resource manager.
For more information on J2EE and how to work in this environment, see the
J2EE specification available at http://java.sun.com/j2ee/docs.html.
Note: This chapter does not show you how to use Derby as
a Resource Manager. Instead, it provides details specific to Derby that
are not covered in the specification. This information is useful to programmers
developing other modules in a distributed J2EE system, not to end-user application
developers.
In order to qualify as a resource manager in a J2EE system, J2EE requires
these basic areas of support. These three areas of support involve implementation
of APIS and are described in "J2EE Compliance: Java Transaction API and javax.sql
Extensions" in the Derby Reference Manual.
This chapter describes the Derby classes
that implement the APIs and provides some implementation-specific details.
