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Auto Download of the Java Platform

Java Rich Internet Applications Guide > Automatic Download and Installation of JRE > Auto Download of the Java Platform

The Windows releases of Java Plug-in and Java Web Start make use of the codebase attribute of the OBJECT element to autodownload and install a particular version of the JRE. See:

The codebase Attribute in Using applet, object, and embed Tags
Creating an auto-install page in Creating the Web Page That Launches the Application

By specifying a particular .cab file in the codebase, a particular version of the JRE can be automatically downloaded and installed as required by an applet or application. For a list of the available .cab files, see Autodownload Files. Note that not every release of the JRE has an associated .cab file for autodownload.