Often, when an applet behaves strangely or fails to work, the problem is hard to diagnose. Many applets behave fine under Netscape Navigator, only to fail under Internet Explorer (or vice versa). Sometimes a different Java Virtual Machine (JVM) will have less tolerance for a bug, and other times the fault lies in the actual JVM implementation.
The lack of information provided by the browser can be frustrating. However, there is a way to display a debugging console, which will provide developers with additional information. For example, an uncaught exception will generate an exception trace, telling you which method and which exception were involved. Both the later versions of Netscape Communicator and Internet Explorer support these debugging consoles.
To view the Java Console in Netscape Communicator
Load any page with an applet, and then select the following menu option
Communicator -> Tools -> Java Console
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