Spring Boot: how to log httpStatus 500 error - spring

Question

I have created a AppErrorController that extends Boot's ErrorController in order to handle status500 errors. The example:
#Controller
public class AppErrorController implements ErrorController {
private static final Logger LOGGER = LogManager.getLogger(AppErrorController.class);
private static final String ERROR = "error";
private static final String ERROR_MESSAGE = "errorMessage";
#RequestMapping(value = "/error")
public String error(Exception e, Model model) {
LOGGER.error("500", e);
model.addAttribute(ERROR_MESSAGE, "Internal server error");
return ERROR;
}
#Override
public String getErrorPath() {
return ERROR;
}
}
I need the error to be logged. But the problem is that Exception e is always null. How to extract the actual error in order to log it?
ADDED
I have a GlobalExceptionHandler, but it never catches '500' errors
#Component
#ControllerAdvice
public class GlobalExceptionHandler {
private static final Logger LOGGER = LogManager.getLogger(GlobalExceptionHandler.class);
private static final String ERROR = "error";
#ExceptionHandler(Exception.class)
public String handleException(Exception e) {
LOGGER.error(e);
return ERROR;
}
}

Answer 1

One way to catch exception from jsp layer is to define your own error-page and point it location to you controller. Then you can extract the actual cause and do with it whatever you like.
web.xml
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/error</location>
</error-page>
ErrorController
#Controller
#RequestMapping("/error")
public class ErrorController {
private final Logger log = LoggerFactory.getLogger(ErrorController.class);
#RequestMapping
public String ex(HttpServletRequest request) {
Throwable throwable = (Throwable) request.getAttribute("javax.servlet.error.exception");
throwable.printStackTrace(); //print
log.error(throwable.getMessage(), throwable); // or log
// or save to db
return "error"; //and redirect to some user-friendly page
}
}