service_2.setDefaultDecryptionKeyId(null);
assertEquals(RSAkid, service_2.getDefaultEncryptionKeyId());
assertEquals(null, service_2.getDefaultDecryptionKeyId());
JWEHeader header = new JWEHeader(JWEAlgorithm.RSA_OAEP, EncryptionMethod.A256GCM);
EncryptedJWT jwt = new EncryptedJWT(header, claimsSet);
service_2.encryptJwt(jwt);
String serialized = jwt.serialize();