[Spring] Spring REST Global Exception Handling

Global Exception Handling

REST CRUD APIs(7)

• Exception handler code is only for the specific REST controller
• Can’t be reused by other controllers <- Large projects will have multiple controllers
• We need global exception handlers
  • Promotes reuse
  • Centralizes exception handling

Spring @ControllerAdvice

• @ControllerAdvice is similar to an interceptor / filter
• Pre-process requests to controllers
• Post-process response to handle exceptions
• Perfect for global exception handling

Development Process

1. Create new @ControllerAdvice
2. Refactor REST service… remove exception handling code
3. Add exception handling code to @ControllerAdvice

Step 1: Create new @ControllerAdvice

File: StudentRestExceptionHandler.java
@ControllerAdvice
public class StudentRestExceptionHandler{

}

Step 2: Refactor - remove exception handling

Step 3: Add exception handler to @ControllerAdvice

File: StudentRestExceptionHandler.java
@ControllerAdvice
public class StudentRestExceptionHandler {
...
	@ExceptionHandler
	public ResponseEntity<StudentErrorResponse> handleException(StudentNotFoundException exc) {

	StudentErrorResponse error = new StudentErrorResponse();

	error.setStatus(HttpStatus.NOT_FOUND.value());
	error.setMessage(exc.getMessage());
	error.setTimeStamp(System.currentTimeMillis());

	return new ResponseEntity<>(error, HttpStatus.NOT_FOUND);
	
	}
}

출처 luv2code.com