How to use local exceptional handler in a Controller ?

Inside controller, provide specific methods for exception handling.

• Define it using @ExceptionHandler annotation and provide exception class to handle.
• Use exception object inside exception handler.
• Return HTTP status and error message in response body using ResponseEntity

EXAMPLE
@Component
@RequestMapping("emp")
public class EmpController {

    @Resource
    private EmployeeRepository employeeRepository;

    @GetMapping
    public ResponseEntity<List<Employee>> getAllEmp() {
        return ResponseEntity.ok((List<Employee>) employeeRepository.findAll());
    }

    @PostMapping
    public ResponseEntity<Employee> emp(@RequestBody Employee emp) {
        return ResponseEntity.ok(employeeRepository.save(emp));
    }

    @ExceptionHandler(Exception.class)
    public ResponseEntity<String> exceptionHandler(final Exception exception) {
        System.out.println("Exception handler inside controller...");
        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("Invalid data");
    }
}

Whenever any of the method inside controller throws the specific exception, this exception handler will be called.