👀 Views: 0 💬 Answers: 1 📅 Created: 2025-08-08

spring-boot jwt rest error-handling

I'm developing a Spring Boot REST API that requires JWT authentication. Everything seems to be configured correctly, but when I try to access a protected endpoint, I'm getting a `500 Internal Server Error` instead of the expected `401 Unauthorized` when the token is invalid. The relevant part of my code is the filter where I validate the JWT token: ```java @Component public class JwtRequestFilter extends OncePerRequestFilter { @Autowired private JwtUtil jwtUtil; @Autowired private UserDetailsService userDetailsService; @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws ServletException, IOException { final String authorizationHeader = request.getHeader("Authorization"); String username = null; String jwt = null; if (authorizationHeader != null && authorizationHeader.startsWith("Bearer ")) { jwt = authorizationHeader.substring(7); try { username = jwtUtil.extractUsername(jwt); } catch (ExpiredJwtException e) { System.out.println("JWT token is expired: " + e.getMessage()); } catch (Exception e) { System.out.println("Invalid JWT token: " + e.getMessage()); } } if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) { UserDetails userDetails = this.userDetailsService.loadUserByUsername(username); if (jwtUtil.validateToken(jwt, userDetails)) { UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities()); usernamePasswordAuthenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request)); SecurityContextHolder.getContext().setAuthentication(usernamePasswordAuthenticationToken); } } chain.doFilter(request, response); } } ``` I've added logging for the exceptions, and I can see the error messages when the token is expired or invalid. However, instead of a clean error response, I receive a `500` error, which makes it hard to debug. I've checked my `application.properties` and my error handling configuration, but it doesn't seem to route the exceptions properly. Here's a snippet from my `application.properties`: ```properties server.error.include-message=always ``` I've also tried adding a global exception handler with `@ControllerAdvice`, but it doesn't seem to catch the exceptions thrown from the filter. How can I ensure that invalid JWT tokens correctly trigger a `401 Unauthorized` response instead of a `500 Internal Server Error`? Any guidance would be greatly appreciated!