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[news.eclipse.newcomer] JFace on Mac OS X

I'm a newbie following "The Definitive Guide to SWT and JFace". I'm getting a runtime error when running a basic HelloWorld application.

Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/core/runtime/IProgressMonitor

I've done all the necessary path setting. When I inspect org.eclipse.core.runtime that came with my copy of Eclipse (3.3 for the Mac) I find that IProgressMonitor isn't in the JAR.

Do I have a bad copy of the library, or is the code I'm using from the book bad?

Thanks in advance!