Equivalent in java API to LdapCtxFactory?

I'm using LdapCtxFactory to query some searches in a LDAP AD, but eclipse shows me a warning

Access restriction: The type 'LdapCtxFactory' is not API (restriction on required library '/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar')

But I can't find an equivalent in Java 8.

This is the code

@Override
    public String executeQuery(String query, String attribute) { //(

        Hashtable<String, String> props = new Hashtable<>();
        props.put(Context.SECURITY_PRINCIPAL, ldapUser);
        props.put(Context.SECURITY_CREDENTIALS, ldapPassword);

        String value = "";

        try {
            DirContext context = LdapCtxFactory.getLdapCtxInstance("ldap://" + adHost + '/', props);

            SearchControls controls = new SearchControls();
            controls.setSearchScope(SUBTREE_SCOPE);

            NamingEnumeration<SearchResult> renum = context.search(activeDirectoryName, query, controls);
            if (!renum.hasMore()) {
                logger.error("Error while querying from ldap");

            }
            SearchResult result = renum.next();

            value = result.getAttributes().get(attribute).get().toString();

        } catch (Exception e) {
            logger.error("Ha ocurrido un error al recuperar el atributo \"{}\" de AD", "", e);
        }

        return value;

    }

I want to get rid of the HastTable too, but "getLdapCtxInstance" only admits HastTables