I am implementing an interceptor for logging purposes. I know once i called the getReader method on HttpServletRequest will loose the body data, but i was experimenting. So i ran the below code, and realized the controller is never invoked (Debug point is not activated) and there was no errors.
@Component
public class IncomingRequestInterceptor extends HandlerInterceptorAdapter {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
String requestPayload = request.getReader().lines().collect(Collectors.joining(System.lineSeparator()));
System.out.println(requestPayload);
return super.preHandle(request, response, handler);
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
super.afterCompletion(request, response, handler, ex);
}
}
And the controller
@PostMapping("/test")
public String test(@Valid @RequestBody CredentialsVo credentials) {
credentials.getUsername();
.............
return "test";
}
Filter Registration
@Configuration
public class MyConfig implements WebMvcConfigurer {
@Autowired
IncomingRequestInterceptor incomingRequestInterceptor;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(incomingRequestInterceptor)
.addPathPatterns("/**");
}
}
if i do not call getReader() method, the controller is invoked. I was actually expecting the controller is called but i would get a null pointer or something like that. Could anyone tell me how spring acts in this scenario ?
