presto-password-authenticators/src/main/java/io/prestosql/plugin/password/jndi/JndiUtils.java/JndiUtils/createDirContext
class JndiUtils:    public static DirContext createDirContext(Map<String, String> environment)
            throws NamingException
    {
        return new InitialDirContext(new Hashtable<>(environment));
    }