Running Java from web pages in 2020

With Java 8 (and the last versions of Java 7), Oracle introduced
a stricter security model for downloaded content.  This means that many
Applets that have loaded and run without trouble for years now
won't work.  In particular, we need to work around these
restrictions in order to run JNLP in the COSC 3550
exam 2.

To do this, we need to list the class web documents as
exceptions to the security policy.  This requires opening
the Java control panel.  In Windows, you do this by
opening Control Panel and then clicking on the Java icon.
On a Mac, you click on the Apple icon, System preferences,
and then the Java icon.  I'm not quite sure what to do
on a Linux system - apparently you may be able to run
the ControlPanel from a command line or search for "java"
commands?

Next, you click on the Security tab of the panel.
Here you might find a check box for "Enable Java content for
browser and Web Start applications.  If so, be sure that box is checked.
Below that you will find some buttons that can choose between
"High" and "Very High" on the top (choose "High")
and an "Exception Site List" on the bottom half.
You want to "Edit Site List" and "Add"

  http://www.mscs.mu.edu/~mikes/
  
to the site list.  The last "/" is critical.  You'll get
a warning message about using an "http:" site, but just
press "continue", then close the panel (probably "Ok").
Finally, close and then restart your browser (if it was open).

To test JNLP, load the page

  http://www.mscs.mu.edu/~mikes/practice.html
  
and click the link to run the SpinDemo program.