TokenCreator.java

@Service
public class TokenCreator {
	
	@Value("${jwtSecret}")
	private String jwtSecret;
	
	private Algorithm algorithm = null;
	
	public TokenCreator() {	}
	
	public String issueToken(String[] claims, String subject, Date expiryDate){
		
		try {
			this.algorithm = Algorithm.HMAC256(jwtSecret);
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    
    /*
     * If no expiry date given, default to a 24hour expiry time
     */
		
		if (expiryDate == null){
			Calendar c = Calendar.getInstance();
			c.setTime(new Date()); // Use today's date.
			c.add(Calendar.HOUR_OF_DAY, 24); // Adds 24 hours 
			expiryDate = c.getTime();
			
		}
		
		Builder tokenBuilder = JWT.create()
				.withIssuer("YOUR ORGANIZATION HERE")
                .withSubject(subject)
                .withExpiresAt(expiryDate);
    
    /*
     * Cycle through the claims and add them to our JWT
     */
		
		for (String claim : claims){
			tokenBuilder.withClaim(claim, true);
		}
		        
		
    /*
     * Sign and issue the JWT
     */
    String issuedToken = tokenBuilder.sign(algorithm);
        
		return issuedToken;
		
	}

}