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In bug 376306 a bug with the Java7 pack200 affected ECF/Smack 3.3 library and prevented installation of features that include it. In this comment: https://bugs.eclipse.org/bugs/show_bug.cgi?id=376306#c20 A method is described to use pack200 from java6 and so avoid problems with embedded jars and 1.7 pack200.
I believe this has been resolved.