In

https://docs.oracle.com/javase/8/docs/technotes/guides/deploy/applet_dev_guide.html

There's a broken link:

For more details, refer to the <a href="http://www.oracle.com/technetwork/java/javase/download-spec-142476.html">JSR 56: Java Network Launching Protocol and API</a>, section 5.4 "Signed Applications" and section 4.7 "Extension Resources."

Change to:

For more details, refer to the <a href="https://www.jcp.org/en/jsr/detail?id=56">JSR 56: Java Network Launching Protocol and API</a>, section 5.4 "Signed Applications" and section 4.7 "Extension Resources."