Errors running Java app on Mac OSX

Hello,
I've written a Java application and packaged it as a JAR file that runs fine on Windows. When I try to run it on
Mac OSX, though, I get the following error:
% java -jar Clavis.jar
Exception in thread "main" java.lang.NoClassDefFoundError:
java/awt/KeyEventDispatcher
at Clavis.main(Clavis.java:7)
I'm assuming this means that the program needs and is somehow not getting access to the java.awt.* classes it requires. How can I tell it where they are? Is it possible to do this within the JAR file so that users don't have to configure this manually?
Five dukes for the first good answer!
Thanks much--
David

From Apple's Java FAQ:
Q: When will Apple have an implementation of J2SE 1.4 available?
A: A Java 1.4 Developer Preview was released at WWDC2002 to all seeded ADC members. This pre-release has only been qualified against the WWDC Jaguar seed, and has not been qualified against any other seeds/builds, including the final release of Mac OS X 10.2. It is for this reason that the WWDC preview has remained unavailable to ADC members, even though Jaguar has shipped.
The product development cycle includes plans to seed an additional, more complete prerelease version of J2SE 1.4.1 to developers. Specific dates for releases have not been determined and are in part dependent upon Sun's release schedule. Please note that J2SE 1.4.x will not be available in any form for versions of Mac OS X prior to 10.2.
If it follows the same pattern as past releases, the answer to your question will probably be months, albeit a low number of them, from Sun's official release date of 1.4.
-SC

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    I have a macintosh Dual G5 running OSX 10.4 and I want to download a compiler, IDE, etc.. so that I can learn to program. I've tried eclipse and I just having a lot of trouble finding something that will work for me. Can anyone please help? thank you so much in advance, Daniel.An IDE is a massive development environment, worthy of plenty of learning time all by itself. Use the command line tools, get used to the concepts of classpaths, and how to structure your projects in the file system first. Then when you have mastered the basics of Java you can move onto the complications of integrated development environments. You can get nice syntax colouring from simple text editors such as TextWrangler, and TextMate.
    IDEs are not beginners tools.

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