Issue with parserBuilder() method in JJWT library for JWT token validation

Question

I'm currently working on a Spring Boot application that uses the JJWT library for JWT token validation. However, I am facing an issue with the parserBuilder() method. My goal is to parse and validate a JWT token using a secret key, but I'm encountering a compilation error that states: "The method parserBuilder() is undefined for the type Jwts."

Here’s a snippet of the code I’m working with:

 import io.jsonwebtoken.Claims;
 import io.jsonwebtoken.Jwts;
 import io.jsonwebtoken.security.Keys;
 import javax.crypto.SecretKey;
 public class JwtTokenValidator {
    public Claims validateToken(String jwt) {
    SecretKey key = Keys.hmacShaKeyFor("mySecretKey".getBytes()); 
    Claims claims = Jwts.parserBuilder()
                        .setSigningKey(key)
                        .build()
                        .parseClaimsJws(jwt)
                        .getBody();
    return claims;
}}

`

Issues I’m Facing:

1. The error message states that parserBuilder() is undefined.
2. I want to ensure that I’m using the correct version of the JJWT library.

Additional Information:

1. I’m using version 0.12.6 of the JJWT library.
2. I’ve imported all the necessary classes from the JJWT package.

Questions:

1. What could be causing the "undefined" error for the parserBuilder() method?
2. Is there a correct way to parse and validate JWT tokens using the JJWT library that I might have missed?

I attempted to use the parserBuilder() method from the JJWT library to parse and validate a JWT token. I set up a SecretKey using Keys.hmacShaKeyFor() and called parserBuilder() on the Jwts class to create a parser, set the signing key, and parse the JWT. However, I encountered a compilation error stating: "The method parserBuilder() is undefined for the type Jwts," which prevented the code from compiling successfully. I expected the code to work without errors and for the Claims object to be returned properly.

Answer 1

parseBuilder was changed to parser() in 0.12 Version.

If you want it to work just change it to parser():

Jwts.parser()
    .setSigningKey(key)
    .build()
    .parseClaimsJws(jwt)
    .getBody();

you will still have some deprecation notices though. Updated version for 0.12.6:

Jwts.parser()
    .verifyWith(key)
    .build()
    .parseSignedClaims(jwt)
    .getPayload();