Load an applet in appletviewer 1.0.2 and then select "Properties" from the "Applet" menu. You'll get the following:

java.lang.NumberFormatException: null
        at java.lang.Integer.parseInt(Integer.java)
        at java.lang.Integer.valueOf(Integer.java)
        at sun.applet.AppletProps.reset(AppletProps.java:103)
        at sun.applet.AppletProps.<init>(AppletProps.java:73)
        at sun.applet.AppletViewer.networkProperties(AppletViewer.java:468)
        at sun.applet.AppletViewer.handleEvent(AppletViewer.java:559)
        at java.awt.Component.postEvent(Component.java:844)
        at java.awt.MenuComponent.postEvent(MenuComponent.java:94)
        at java.awt.MenuComponent.postEvent(MenuComponent.java:94)
        at java.awt.MenuComponent.postEvent(MenuComponent.java:94)
        at sun.awt.motif.MMenuItemPeer.action(MMenuItemPeer.java:44)
        at java.lang.Thread.run(Thread.java)

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The above description is missing one vital point.

The steps to reproduce this bug are :

Run appletviewer
From the menu Applet->Properties, set the Http proxy server, but don't set
the Http proxy port, and press the Apply button.
You get a NumberFormatException on 1.2beta4 and 1.1.6

mick.fleming@Ireland 1998-06-29