Correctly serialize Zalando Problem thrown from Spring filter-CodePudding

I'm using Zalando's Problem library and am running in the following problem (pun intended):

Everything works fine for problems thrown from normal controllers. In this case I have a custom Spring filter. If I throw a problem from the filter, the response is 500 error (shown using the standard spring error page), and not a 400 error as indicated in the problem. With other words, the exception is thrown like a normal exception, instead of being correctly serialised as a JSON response.

How can I make sure problems thrown from filter's are also correctly handled/serialised?

My code:


@Component
class UserVerifiedFilter : OncePerRequestFilter() {

    @Throws(ServletException::class, IOException::class)
    override fun doFilterInternal(
        request: HttpServletRequest,
        response: HttpServletResponse,
        filterChain: FilterChain
    ) {

       // ...
        throw Problem.builder()
            .withType(URI.create("https://example.org/email-unverified"))
            .withTitle("Email unverified")
            .withStatus(Status.BAD_REQUEST)
            .withDetail("Email needs to verified to use this endpoint")
            .build()


    }
}

@RestControllerAdvice
class ControllerExceptionHandler : ProblemHandling, SecurityAdviceTrait

CodePudding user response：

Managed to solve this by adding another filter, as the first one in the chain.

This filter catches any exception and manually propagates it to the configured exception handlers.

@Component
class FilterExceptionHandler : OncePerRequestFilter() {
    @Autowired
    private lateinit var resolver: HandlerExceptionResolver

    private val logger = LoggerFactory.getLogger(javaClass)

    @Throws(ServletException::class, IOException::class)
    override fun doFilterInternal(
        request: HttpServletRequest,
        response: HttpServletResponse,
        filterChain: FilterChain
    ) {
        try {
            filterChain.doFilter(request, response)
        } catch (exception: Exception) {
            logger.error("Spring Security filter chain exception : {}", exception)
            resolver.resolveException(request, response, null, exception)
        }
    }
}