How to use

toString

method

in

com.nimbusds.jose.util.Base64

/**
 * Overrides {@code Object.equals()}.
 *
 * @param object The object to compare to.
 *
 * @return {@code true} if the objects have the same value, otherwise
 *         {@code false}.
 */
@Override
public boolean equals(final Object object) {
  return object != null && 
      object instanceof Base64 && 
      this.toString().equals(object.toString());
}

public String getSecretBase64() {
  return Base64.encode(secret).toString();
}

public String getSecretBase64() {
  return Base64.encode(secret).toString();
}

  sb.append(Base64.encode(cert.getEncoded()).toString());
} catch (CertificateEncodingException e) {
  return null;

jwk.setX5c(nimbusJwk.getX509CertChain().stream().map(cert -> cert.toString()).collect(Collectors.toSet()));