Hi All,

I am trying to generate JWT token in my standalone Java code by following the guideline provided in https://developer.okta.com/docs/guides/build-self-signed-jwt/java/main/*build-a-jwt-with-a-private-key

However while generating the JWT using the private key I am getting below exception:

Base64-encoded key bytes may only be specified for HMAC signatures. If using RSA or Elliptic Curve, use the signWith(SignatureAlgorithm, Key) method instead.

Below is code snippet:

public void getJWT1() throws Exception

{

Gson gson = new Gson();

Map<String,String> keyMap = new HashMap<>();

keyMap.put("d", "Value");

keyMap.put("q","Value");

keyMap.put("p", "Value");

keyMap.put("dp", "Value");

keyMap.put("dq", "Value");

keyMap.put("qi", "Value");

keyMap.put("kty", "RSA");

keyMap.put("e", "AQAB");

keyMap.put("kid", "sVdxUhe6FJ1d0uDp4-qPqkCbrR1SnZUmXXFiVhKP4rw");

keyMap.put("n", "Value");

String key = gson.toJson(keyMap);

Instant now = Instant.now();

String UUID="avbch";

String jwt = Jwts.builder()

    .setAudience("https://tenent-url/oauth2/default/v1/token")

    .setIssuedAt(Date.from(now))

    .setExpiration(Date.from(now.plus(5L, ChronoUnit.MINUTES)))

    .setIssuer("Clinet Id")

    .setSubject("Client id")

    .setId(UUID) 

    .signWith(SignatureAlgorithm.RS256, key)

    .compact();

System.out.println(jwt);

Also when I try to generate using client id and secret using same article I get below exception

Exception in thread "main" java.lang.NoSuchMethodError: io.jsonwebtoken.SignatureAlgorithm.getMinKeyLength()I

at io.jsonwebtoken.security.Keys.hmacShaKeyFor(Keys.java:69)

Let me know if anyone can suggest the changes to make this working.

Regards

Rahul Jha