Java 8 Lambda Util expect()

    /**
     * Wrap a Supplier in a try-catch, if an exception of class exceptionClass is caught, an empty Optional is returned.
     */
    public static <T> Optional<T> expect(Supplier<T> supplier, Class<? extends Exception> exceptionClass) {
        try {
            return Optional.ofNullable(supplier.get());
        }
        catch (Exception ex) {
            if (exceptionClass.isInstance(ex)) {
                return Optional.empty();
            }
            throw ex;
        }
    }