springboot exceptionhandling without controller class - spring-boot

Question

How to handle exception handling in Spring Boot 1.5.4 without controller class? Currently, I have only entity & repository class as below.
Task.class: (entity)
#Entity
#Table(name = "task")
public class Task implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
private long id;
#Length(min = 1)
private String name;
public Task() {
}
public Task(String name) {
this.name = name;
}
public Task(Long id, String name) {
this.name = name;
}
public long getId() {
return id;
}
public String getName(){
return name;
}
}
Repository.class:
public interface TaskRepository extends PagingAndSortingRepository<Task, Long> {
}
POST method: return 200 ok
http://localhost:8080/tasks
{
"name" : "test"
}
But,
{
"name" : ""
}
returns 500 , instead of 400 error.
Pls let me know, if any way to handle this exception without a controller class.

Answer 1

You could use a global #ExceptionHandler with the #ControllerAdvice annotation. Basically, you define which Exception to handle with #ExceptionHandler within the class with #ControllerAdvice annotation, and then you implement what you want to do when that exception is thrown.
Like this:
#ControllerAdvice(basePackageClasses = RepositoryRestExceptionHandler.class)
public class GlobalExceptionHandler {
#ExceptionHandler({ValidationException.class, JsonParseException.class})
public ResponseEntity<Map<String, String>> yourExceptionHandler(Exception e) {
Map<String, String> response = new HashMap<String, String>();
response.put("message", "Bad Request");
return new ResponseEntity<Map<String, String>>(response, HttpStatus.BAD_REQUEST);
}
}
See also: http://www.ekiras.com/2016/02/how-to-do-exception-handling-in-springboot-rest-application.html