protected JwtSigner createSigner(SignatureAlgorithm alg, Key key) {
        return new DefaultJwtSigner(alg, key, base64UrlEncoder);
    }
protected JwtSigner createSigner ( SignatureAlgorithm alg , Key key ) { return new DefaultJwtSigner ( alg , key , base64UrlEncoder ) ; }
/*
@since 0.5 mostly to allow testing overrides