How can I fix these java errors?

ava.lang.NullPointerException
     at sun.font.FontDesignMetrics.stringWidth(Unknown Source)
     at IpixViewer.start(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NullPointerException
java.lang.NullPointerException
     at sun.font.FontDesignMetrics.stringWidth(Unknown Source)
     at IpixViewer.start(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NullPointerException
java.lang.InterruptedException: sleep interrupted
     at java.lang.Thread.sleep(Native Method)
     at bb.run(Unknown Source)
load: class org.jdesktop.applet.util.JNLPAppletLauncher not found.
java.lang.ClassNotFoundException: org.jdesktop.applet.util.JNLPAppletLauncher
     at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException: org.jdesktop.applet.util.JNLPAppletLauncher
Thank you.

>
What do you mean a demo? I have tried to open pages e.g. on the http://www.jollylearning.co.uk/ website there is a preview of the books. I can't access this. The second error comes up. >
Oh (silly grin) sorry. I thought you were a developer trying to debug one of your own projects.
Your best bet is to take up the matter with whoever provides that site/applet. I did not see an obvious 'contact' form on the main page, but the message boards would be a good place to start.

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