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See the link above - the preferred way of setting the classpath is not through an environmental variable, but by using the -cp command line option to javac and java

I've never heard a debate (not denyong one does not exist, but please quote sources)...if you wish to deploy your application to other computers and platforms, its best practice to add the library to...

Print out the full exception stack trace...it has a lot more information than and will give you (and us) a much better sense as to the problem.