[pde-ui-dev] NoClassDefFoundError

["Lane, Ron [IT]" <ron.lane@xxxxxxxxxxxxx>]

My plugin creates a project, and I want to add 
the Java flavor to it.  I thought I would add a WizardPage that is
based on org/eclipse/jdt/ui/wizards/JavaCapabilityConfigurationPage.

This works fine on my PC (both in PDE dev and when I expand the
plugin zip file into the plugins directory).  But when I package it up and someone else 
tries it, they get:

java.lang.NoClassDefFoundError: org/eclipse/jdt/ui/wizards/JavaCapabilityConfigurationPage
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at org.eclipse.osgi.framework.adaptor.core.DefaultClassLoader.defineClass(DefaultClassLoader.java:370)
	at org.eclipse.core.runtime.adaptor.EclipseClassLoader.defineClass(EclipseClassLoader.java:227)
	at org.eclipse.osgi.framework.adaptor.core.DefaultClassLoader.findClassImpl(DefaultClassLoader.java:343)
	at org.eclipse.osgi.framework.adaptor.core.DefaultClassLoader.findClass(DefaultClassLoader.java:235)
	at org.eclipse.osgi.framework.adaptor.core.AbstractClassLoader.findLocalClass(AbstractClassLoader.java:183)
	at org.eclipse.core.runtime.adaptor.EclipseClassLoader.basicFindLocalClass(EclipseClassLoader.java:141)
	at org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java:68)
	at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:337)
	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:389)
	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:350)
	at org.eclipse.osgi.framework.adaptor.core.AbstractClassLoader.loadClass(AbstractClassLoader.java:78)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)

Both I and the other user are using the same version of Eclipse and Java.  So 
what's going on, and how do I get around this problem?

If you could reply to me directly (as well as the list) I would appreciate it,
just in case I miss the reply to the list.

Ron