@Override
public void start(BundleContext context) throws Exception {
    ServiceReference packageAdminRef = context.getServiceReference(PackageAdmin.class.getName());
    PackageAdmin packageAdmin = (PackageAdmin)context.getService(packageAdminRef);

    getBundle("org.eclipse.equinox.ds", packageAdmin); //$NON-NLS-1$
    getBundle("org.eclipse.equinox.frameworkadmin.equinox", packageAdmin); //$NON-NLS-1$
    getBundle("org.eclipse.equinox.simpleconfigurator.manipulator", packageAdmin); //$NON-NLS-1$
    getBundle("org.eclipse.equinox.p2.engine", packageAdmin); //$NON-NLS-1$
}

private static void getBundle(String symbolicName, PackageAdmin packageAdmin)
          throws BundleException {
    if (packageAdmin != null) {
      Bundle[] bundles = packageAdmin.getBundles(symbolicName, null);
      if (bundles != null) {
        for (int i = 0; i < bundles.length; i++) {
          if ((bundles[i].getState() & (Bundle.INSTALLED | Bundle.UNINSTALLED)) == 0) {
            bundles[i].start(Bundle.START_TRANSIENT);
          }
        }
      }
    }
}