In Java, an extension is a formally described set of related classes that extends the functionality offered by the base Java platform or by a J2EE application server. Extensions are packaged as Java JAR files, and include additional information in the JAR file’s manifest.mf file to describe the extensions characteristics, such as:
The vendor, name, and version for the specification that is implemented by the package (for example, Sun Microsystems JavaHelp 1.3)
The vendor, name, and version for the implementation of the specification.
For more information on Java extensions, see the the Java documentation.
In accord with the Servlet 2.3 specification, EAServer allows you to install extensions and define the extensions required by a Web application. If you import a Web application (in WAR format) that requires extensions that are not installed, EAServer Manager warns you of the unfulfilled dependencies.
