public static <E extends Throwable> void unwrapIf(RuntimeException e, Class<E> c) throws E {
        if (e.getCause() != null && c.isInstance(e.getCause())) {
//            throw (E) e.getCause();
            throw new RepositoryException("pouet");
        } else if (e instanceof RuntimeException) {
            throw e;
        } else {
            throw new IllegalStateException("Unexpected exception (Yo Dawg!): " + e.getMessage(), e);
        }
    }