JWT usage in Rest Controller while accessing resource passing the existing JWT

CodeParsingJWT_ReceivedFromRequest.java

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;

    final HttpServletRequest req = (HttpServletRequest) request;
		
		final String authHeader = req.getHeader("authorization");

			if (authHeader == null || !authHeader.startsWith("Bearer ")) {
				throw new ServletException("Missing or invalid Authorization header");
			}

			final String token = authHeader.substring(7);

			final Claims claims = Jwts.parser().setSigningKey("secretkey").parseClaimsJws(token).getBody();

			req.setAttribute("claims", claims);
	
		}