ExceptionHandler shared by multiple controllers

Question

Is it possible to declare ExceptionHandlers in a class and use them in several controllers, because copying exception handlers in each controller will be redundant.

-Class declares exception handlers:

@ExceptionHandler(IdentifiersNotMatchingException.class) @ResponseStatus(HttpStatus.BAD_REQUEST) def @ResponseBody String handleIdentifiersNotMatchingException(IdentifiersNotMatchingException e) { logger.error("Identifiers Not Matching Error", e) return "Identifiers Not Matching Error: " + e.message } @ExceptionHandler(ResourceNotFoundException.class) @ResponseStatus(HttpStatus.NOT_FOUND) def @ResponseBody String handleResourceNotFoundException(ResourceNotFoundException e) { logger.error("Resource Not Found Error", e) return "Resource Not Found Error: " + e.message } 

-ContactController

 @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class) @RequestMapping(value = "contact/{publicId}", method = RequestMethod.DELETE) def @ResponseBody void deleteContact(@PathVariable("publicId") String publicId) throws ResourceNotFoundException, IdentifiersNotMatchingException {...} 

-LendingController

 @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class) @RequestMapping(value = "lending/{publicId}", method = RequestMethod.PUT) def @ResponseBody void updateLending(@PathVariable("publicId") String publicId, InputStream is) throws ResourceNotFoundException {...} 

Answer 1

One way to do this is to create a base class that will expand your controllers (can be abstract). Then the base class can store all the “common” things, including exception handlers, as well as load general model data, such as user data.

Answer 2

You can declare HandlerExceptionResolver as a bean to be used on each controller. You just check the type and process it as you want.

Answer 3

Or you can create an interface for handling exceptions and inject it into your controller class.