使用spring验证：在包含@valid和验证注释的restful服务中没有返回消息

Question

Rest 服务：Spring boot、Postman、Tomcat、maven 是我用来验证数据的技术和工具：我期待 postman 响应中的一些消息。您能否建议我在下面的代码中必须确保的更改是什么。

    @RestController
    @RequestMapping("/requestShipment")
    @Validated
    public class ShipmentRequestController {
    
        @GetMapping
        public String requestShipment(@Valid @RequestBody  ShipmentRequest shipmentRequest) {
            System.out.println("helloo");
            return "Sampleclass";
        }
        
        /*
         * @PostMapping(value="/sampleclass") public @ResponseBody void
         * requestSampleClass(@Valid @RequestBody SampleClass sampleclass) {
         * 
         * }
         */
        
        @GetMapping(value="/sampleclass")
        public String requestSampleClass(@Valid @PathParam("data") @NotNull String data) {
            return data;
        }
    }
    
    Postman request : (according to the request, last method will be called)
    http://localhost:8080/requestShipment/sampleclass
    Result I am getting from postman :
    
    {
        "timestamp": "2020-10-24T06:27:07.376+00:00",
        "status": 500,
        "error": "Internal Server Error",
        "message": "",
        "path": "/requestShipment/sampleclass"
    }
    
if you could observe in above response,  message attribute is null
Expected result : message had to be written. something like " requestSampleClass.data: must not be null"
    
    Error in the Spring boot console :
    javax.validation.ConstraintViolationException: requestSampleClass.data: must not be null
        at org.springframework.validation.beanvalidation.MethodValidationInterceptor.invoke(MethodValidationInterceptor.java:116) ~[spring-context-5.2.9.RELEASE.jar:5.2.9.RELEASE]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE]
        at com.rakuten.shipment.controller.ShipmentRequestController$$EnhancerBySpringCGLIB$$e373f1a4.requestSampleClass(<generated>) ~[classes/:na]
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]

Answer 1

@PathParam 不是有效的 Spring 注释，因此 Spring 没有填充该值。我不确定您要添加什么依赖项来提供它，但您可能正在混合系统。 （你也在路径中没有任何占位符，所以它根本没有意义。）我认为你想要@RequestParam。