code: @Override
      public void stop(BundleContext ctx) throws Exception {
          // Unregister the EclipseLinke provider
          if (elSvcReg != null) {
              elSvcReg.unregister();
              elSvcReg = null;
          }
      }
docs: /*
  Removes the EclipseLinke provider from the OSGi service registry.
  
  @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)