Sun Java System Web Server includes the JDK version 1.4.1_03. While in previous versions of the Web server, Java was configured server-wide, in the 6.1 release, you can configure Java per instance of the Web server.
You may use the JDK that is bundled with Sun Java System Web Server 6.1 or you may use a JDK of your choice, in which case you must specify a path to the JDK. For more information on how you can do this, see Configuring JVM Settings.
By default, Java is disabled when you install the Sun Java System Web Server. In order to enable servlets, you must first enable Java.
For information on how you can enable Java, see Enabling and Disabling Java.