无法捕获Spring数据REST中的DataIntegrityViolationException

Question

尝试使用ControllerAdvice处理DataIntegrityViolationException并使用Spring Boot v1.3.3和Spring Data REST v2.4.4返回自定义响应。以下是我的课程：

ExceptionControllerAdvice.java

@ResponseStatus(HttpStatus.CONFLICT)
@ExceptionHandler(DataIntegrityViolationException.class)
public ViolationResponse handleConflictException(DataIntegrityViolationException ex) throws Exception {
    return new ViolationResponse(ex.getMessage());
}

public class ViolationResponse {

private String message;

public ViolationResponse(String message) {
    this.message = message;
}

public String getMessage() {
    return message;
}

public void setMessage(String message) {
    this.message = message;
}
}

但我得到的是404状态,而不是这个响应：

{“时间戳”：1463382639043“状态”：404“错误”：“找不到”“异常”：“org.springframework.dao.dataintegrityviolationexception”“消息”：“无法执行语句；SQL[n/a]；约束[email_exists_constraint]；嵌套异常为org.hibernate.exception.constraintviolationexception：无法执行语句”“path”：“/api/v1/register”}

我错过了什么？如何达到预期的效果？

authController.java

@RestController
@RequestMapping("/api/v1")
public class AuthController {
...
@RequestMapping(value = "/register", method = RequestMethod.POST)
public User register(@Valid @RequestBody User user, BindingResult result) throws ValidationException {
    if (result.hasErrors()) {
        throw new ValidationException(result.getAllErrors());
    }
    return userRepository.save(user);
}

Answer 1

在ExceptionControllerAdvice.java中使用@ResponseBody注释您的方法handleConflictException。这将告诉spring从返回对象生成一个JSON。@RestController在内部包含@ResponseBody，@ControllerAdvice不包含。