Using "JDK-1.2beta3-N", on Solaris, can't run the applet when invoking "appletviewer SwingApplet.html" from the demo/jfc/SwingApplet directory AFTER removing the SwingApplet.class

Appletviewer throws the following exception while running swing applet with SwingApplet.jar file alone. It works fine, when run with the associated SwingApplet.class file.

To reproduce:
copy JDK1.2beta3-N SwingApplet in /tmp.
cd /tmp/SwingApplet
appletviewer SwingApplet.html

Appletviewer works fine with SwingApplet.html as long as SwingApplet.class exist.

Now remove the SwingApplet.class in /tmp/SwingApplet, then run Appletviewer, it throws the following exception:

        at java.awt.swing.JApplet.createRootPane(JApplet.java:123)
        at java.awt.swing.JApplet.<init>(JApplet.java:97)
        at SwingApplet.<init>(SwingApplet.java:30)
        at java.lang.Class.newInstance(Native Method)
        at sun.applet.AppletPanel.createApplet(AppletPanel.java:459)
        at sun.applet.AppletPanel.runLoader(AppletPanel.java:395)
        at sun.applet.AppletPanel.run(AppletPanel.java:234)
        at java.lang.Thread.run(Thread.java:490)