return null;
      }
      ClassLoader systemLoader;
      try {
        systemLoader = ClassLoader.getSystemClassLoader();
      } catch (SecurityException e) {
        logger.info("Not allowed to access system class loader.");
        return null;
      }
      if (systemLoader != null) {
        try {
          return systemLoader.loadClass(FINALIZER_CLASS_NAME);

        return null;
      }
      ClassLoader systemLoader;
      try {
        systemLoader = ClassLoader.getSystemClassLoader();
      } catch (SecurityException e) {
        logger.info("Not allowed to access system class loader.");
        return null;
      }
      if (systemLoader != null) {
        try {
          return systemLoader.loadClass(FINALIZER_CLASS_NAME);

    // and each test creates its own one of those, so there is no test interference here.
    Class<?> sepFrqSystemLoaderC =
        sepLoader.loadClass(FinalizableReferenceQueue.SystemLoader.class.getName());
    Field disabled = sepFrqSystemLoaderC.getDeclaredField("disabled");
    disabled.setAccessible(true);
    disabled.set(null, true);

    // and each test creates its own one of those, so there is no test interference here.
    Class<?> sepFrqSystemLoaderC =
        sepLoader.loadClass(FinalizableReferenceQueue.SystemLoader.class.getName());
    Field disabled = sepFrqSystemLoaderC.getDeclaredField("disabled");
    disabled.setAccessible(true);
    disabled.set(null, true);