我正在尝试使用@ControllerAdvice处理MethodArgumentNotValidException作为下面给出的代码：
@ControllerAdvice
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
private Logger log = LoggerFactory.getLogger(RestResponseEntityExceptionHandler.class);
@Autowired
private ApplicationContext applicationContext;
@ExceptionHandler({ ConstraintViolationException.class })
@ResponseStatus(HttpStatus.BAD_REQUEST)
@ResponseBody
public ErrorWrapper handleConstraintViolationException(ConstraintViolationException e) {
String fieldName = e.getConstraintName();
String message = getResourceMessage(fieldName + ".alreadyExists", "Already Exists");
return new ErrorWrapper(fieldName + ".error", message);
}
@ExceptionHandler({ MethodArgumentNotValidException.class })
@ResponseStatus(HttpStatus.BAD_REQUEST)
@ResponseBody
public ErrorWrapper handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
return new ErrorWrapper(".error", "test");
}
private String getResourceMessage(String key, String defaultMessage) {
String message = applicationContext.getMessage(key, null, Locale.getDefault());
if (StringUtils.isNotEmpty(message)) {
return message;
}
return defaultMessage;
}
}
我正在关注异常
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#0': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous @ExceptionHandler method mapped for [class org.springframework.web.bind.MethodArgumentNotValidException]: {public com.ca.bean.ErrorWrapper com.ca.exceptionHandler.RestResponseEntityExceptionHandler.handleMethodArgumentNotValidException(org.springframework.web.bind.MethodArgumentNotValidException), public final org.springframework.http.ResponseEntity org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler.handleException(java.lang.Exception,org.springframework.web.context.request.WebRequest)}
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:775) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) ~[spring-context-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) ~[spring-context-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444) ~[spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326) ~[spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) [spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5099) [catalina.jar:7.0.70]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5615) [catalina.jar:7.0.70]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) [catalina.jar:7.0.70]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1571) [catalina.jar:7.0.70]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561) [catalina.jar:7.0.70]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_92]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_92]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_92]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_92]
Caused by: java.lang.IllegalStateException: Ambiguous @ExceptionHandler method mapped for [class org.springframework.web.bind.MethodArgumentNotValidException]: {public com.ca.bean.ErrorWrapper com.ca.exceptionHandler.RestResponseEntityExceptionHandler.handleMethodArgumentNotValidException(org.springframework.web.bind.MethodArgumentNotValidException), public final org.springframework.http.ResponseEntity org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler.handleException(java.lang.Exception,org.springframework.web.context.request.WebRequest)}
at org.springframework.web.method.annotation.ExceptionHandlerMethodResolver.addExceptionMapping(ExceptionHandlerMethodResolver.java:109) ~[spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.web.method.annotation.ExceptionHandlerMethodResolver.<init>(ExceptionHandlerMethodResolver.java:76) ~[spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver.initExceptionHandlerAdviceCache(ExceptionHandlerExceptionResolver.java:265) ~[spring-webmvc-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver.afterPropertiesSet(ExceptionHandlerExceptionResolver.java:241) ~[spring-webmvc-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
... 21 common frames omitted
我正在使用spring 4.3.0。 我想处理MethodArgumentNotValidException并希望发送自定义消息。我在做什么错？请帮忙。
答案 0 :(得分：51)
Springs ResponseEntityExceptionHandler有一个方法handleException，注释时为：
@ExceptionHandler({
...
MethodArgumentNotValidException.class,
...
})
您的方法handleMethodArgumentNotValidException也被注释为处理MethodArgumentNotValidException。因此Spring发现了两个应该用于处理相同异常的方法，这就是异常的原因。
**解决方案** 不要添加新方法handleMethodArgumentNotValidException，而只是覆盖方法ResponseEntityExceptionHandler.handleMethodArgumentNotValid，并且不要对其进行注释。 你的类ErrorWrapper必须扩展ResponseEntity。
答案 1 :(得分：5)
尝试覆盖方法 handleMethodArgumentNotValid ， 在我的情况下，方法变为这样：
@Override
protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex,
HttpHeaders headers, HttpStatus status,
WebRequest request) {
String errorMessage = ex.getBindingResult().getFieldErrors().stream()
.map(DefaultMessageSourceResolvable::getDefaultMessage)
.findFirst()
.orElse(ex.getMessage());
return response(ex, request, HttpStatus.BAD_REQUEST, errorMessage);
}
private ResponseEntity<Object> response(Exception ex, WebRequest request, HttpStatus status,
String message) {
return handleExceptionInternal(ex, message, header(), status, request);
}
答案 2 :(得分：2)
处理异常
@ControllerAdvice
@RestController
@Slf4j
public class ExceptionHandler extends ResponseEntityExceptionHandler {
@Override
protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
List<String> errorList = ex
.getBindingResult()
.getFieldErrors()
.stream()
.map(fieldError -> fieldError.getDefaultMessage())
.collect(Collectors.toList());
ErrorDetails errorDetails = new ErrorDetails(HttpStatus.BAD_REQUEST, ex.getLocalizedMessage(), errorList);
return handleExceptionInternal(ex, errorDetails, headers, errorDetails.getStatus(), request);
}
}
}
自定义错误消息
@Data
public class ErrorDetails {
private HttpStatus status;
private String message;
private List<String> errors;
public ErrorDetails(HttpStatus status, String message, List<String> errors) {
super();
this.status = status;
this.message = message;
this.errors = errors;
}
public ErrorDetails(HttpStatus status, String message, String error) {
super();
this.status = status;
this.message = message;
errors = Arrays.asList(error);
}
}
示例响应
{
"status": "BAD_REQUEST",
"message": "Validation failed for argument [0] in public void com.ns.hospitalmanagement.resource.PatientResource.createPatient(com.ns.hospitalmanagement.entity.Patient) with 2 errors: [Field error in object 'patient' on field 'name': rejected value [null]; codes [NotNull.patient.name,NotNull.name,NotNull.java.lang.String,NotNull]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [patient.name,name]; arguments []; default message [name]]; default message [Name Can not be Null]] [Field error in object 'patient' on field 'name': rejected value [null]; codes [NotEmpty.patient.name,NotEmpty.name,NotEmpty.java.lang.String,NotEmpty]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [patient.name,name]; arguments []; default message [name]]; default message [Name Can not be Empty]] ",
"errors": [
"Name Can not be Null",
"Name Can not be Empty"
]
}