The link to the JNLP specification is broken:

http://www.oracle.com/technetwork/java/javase/download-spec-142476.html

It's probably gone from OTN.

Add this to the Java SE Developer Guides.

For now, I removed references to the JNLP specification from the following places:

http://docs.oracle.com/javase/8/docs/technotes/guides/jweb/applet_migration.html

 <p>If you want to deploy extensions for your Java Web Start application, use the JNLP extension protocol mechanism. For more details, refer to the <a href="http://www.oracle.com/technetwork/java/javase/download-spec-142476.html">JNLP specification</a>, section 3.8 &quot;Extension Descriptor.&quot;</p>

<p>For signed JAR files, similar to Java Plug-in technology, you can sign your application JAR files and request your application to be run with all-permissions by means of the JNLP file. In Java Plug-in technology, your applet JARs can be signed by different certificates. In Java Web Start technology, the same certificate must be used to sign all JAR files (<code>jar</code> and <code>nativelib</code> elements) that are part of a single JNLP file. This simplifies user management since only one certificate must be presented to the user during a launch per JNLP file. If you need to use JARs signed with different certificates, you can put them in a component extension JNLP file, and reference it from the main JNLP file. For more details, refer to the <a href="http://www.oracle.com/technetwork/java/javase/download-spec-142476.html">JNLP specification</a>, section 5.4 &quot;Signed Applications&quot; and section 4.7 &quot;Extension Resources.&quot;</p>