ModelResolverExtensionPoint modelResolvers = registry.getExtensionPoint(ModelResolverExtensionPoint.class);
// Create contribution package processor extension point
TypeDescriber describer = new PackageTypeDescriberImpl();
PackageProcessor packageProcessor =
new ExtensiblePackageProcessor(registry.getExtensionPoint(PackageProcessorExtensionPoint.class), describer, monitor);
// Create contribution listener
ExtensibleContributionListener contributionListener =
new ExtensibleContributionListener(registry.getExtensionPoint(ContributionListenerExtensionPoint.class));