Java Reference
In-Depth Information
Chapter 2. What's New in JBoss AS 7
This chapter will provide you with a crash course in the new application server so that
we will be able to deploy our first Java EE 6 application in the next chapter. More spe-
cifically, we will cover the following topics:
• An introduction to the AS 7 core concepts
• The anatomy of the JBoss AS 7 filesystem
• An introduction to the available management instruments
• Deploying your first HelloWorld application
AS 7 core concepts
Now that we have downloaded and installed JBoss AS 7, it is worth familiarizing
ourselves with some basic concepts. Initially, JBoss AS 7 can be run in two modes:
the standalone mode and the domain mode.
In the
standalone
mode, each JBoss Application Server 7 instance is an independent
process (similar to the previous JBoss AS versions, such as Version 4, Version 5, or
Version 6). The standalone configuration files are located under the standalone/con-
figuration of the application server.
In the
domain
mode, you can run multiple application servers and manage them from
a central point. A domain can span multiple physical (or virtual) machines. On each
machine we can install several instances of JBoss Application Server 7, that are un-
der the control of a Host Controller process. The configuration files in the domain
mode are located under the
domain/configuration
folder of the application serv-
er.
From the process point of view, a domain is made up of three elements:
•
Domain Controller
: The domain controller is the management control
point of your domain. An AS instance running in the domain mode will
have, at the most, one process instance acting as a domain controller. The
domain controller holds a centralized configuration, which is shared by the
node instances belonging to the domain.
