I'm not familiar with HP diagnostics but from the errors it looks like you need to make the com.mercury.opal.* packages available to CQ.Changing the org.osgi.framework.bootdelegation setting to include com.mercury.opal.* might help, but in general it is cleaner to use fragment bundles to export such...

See also the Sling Post Servlet documentation at http://sling.apache.org/documentation/bundles/manipulating-content-the-slingpostservlet-servlets-post.html