Exception handling is a critical part of any application. In a Spring Boot application, there are a few ways to implement exception handling.
In this post, we'll go over some of the basics of exception handling in a Spring Boot application. We'll start with a simple example, then we'll go over some more advanced topics.
The simplest way to handle exceptions in a Spring Boot application is to use the @ControllerAdvice annotation. This annotation can be used on a class to handle exceptions globally.
For example, let's say we have a simple controller that returns a list of users:
@RestController
public class UserController {
@GetMapping("/users")
public List<User> getUsers() {
// ...
}
}
If there is an error while getting the list of users, we can use the @ControllerAdvice annotation to handle the exception:
@ControllerAdvice
public class ExceptionHandlerController {
@ExceptionHandler(Exception.class)
public ResponseEntity<ErrorResponse> handleException(Exception ex) {
// ...
}
}
In the above example, we're using the @ExceptionHandler annotation to handle any exceptions that occur in our controller. We're also using the @ControllerAdvice annotation to make sure that our exception handler is applied globally.
In some cases, you may want to have more control over how exceptions are handled. For example, you may want to return a different response for different types of exceptions.
In Spring Boot, you can use the @ExceptionHandler annotation to handle specific types of exceptions. For example, let's say we have a controller that returns a list of users:
@RestController
public class UserController {
@GetMapping("/users")
public List<User> getUsers() {
// ...
}
}
If there is an error while getting the list of users, we can use the @ExceptionHandler annotation to handle the exception:
@ControllerAdvice
public class ExceptionHandlerController {
@ExceptionHandler(UserNotFoundException.class)
public ResponseEntity<ErrorResponse> handleUserNotFoundException(UserNotFoundException ex) {
// ...
}
@ExceptionHandler(Exception.class)
public ResponseEntity<ErrorResponse> handleException(Exception ex) {
// ...
}
}
In the above example, we're using the @ExceptionHandler annotation to handle specific types of exceptions. We're also using the @ControllerAdvice annotation to make sure that our exception handler is applied globally.
Exception handling is a critical part of any application. In a Spring Boot application, there are a few ways to implement exception handling.
In this post, we've gone over some of the basics of exception handling in a Spring Boot application. We've started with a simple example, then we've gone over some more advanced topics.