Application server core building blocks
The whole server configuration is XML based and it is strictly ruled by a set of XML schemas. The configuration schemas are located in the JBOSS_HOME/docs/schema/
directory of your installation. Each configuration file has a set of mandatory elements which include the following.
Extensions
Every Java library that is installed into the application server is called a module. An extension is a special kind of module that is strictly bound to the application server life cycle and is managed through the core server configuration. The configuration of the extension, if any, is declared in a subsystem section. Here is an excerpt of the server configuration which declares a set of extensions (such as the logging extension), ...
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