feign.FeignException: status 404 reading XXXClient#XXMethod(String)_综合

在一次feign调用中，有一个需求，根据订单编号查询订单，接口如下：

@FeignClient(name = "order", path = "/")
public interface OrderFeignService {@GetMapping(value = "/order/{orderNumber}")BizOrderModel checkBizOrderExist(@PathVariable("orderNumber") String orderNumber);
}

实现如下：

@RestController
@RequestMapping("/")
public class OrderController implements OrderFeignService {	@Override@GetMapping(value = "/order/{orderNumber}")public BizOrderModel checkBizOrderExist(@PathVariable("orderNumber") String orderNumber) {return orderService.findByOrderNumber(orderNumber);}
}

调用如下：

@Service
@Slf4j
public class OrderService {@AutowiredOrderFeignService orderFeignService;public void test(){if (null == orderFeignService.checkBizOrderExist(dto.getOrderNumber())) {LOG.ERROR("订单信息不存在");}
}

异常信息如下：

feign.FeignException: status 404 reading XXXXClient#XXXXMethod(Long)

   at feign.FeignException.errorStatus(FeignException.java:62)
   at feign.codec.ErrorDecoder$Default.decode(ErrorDecoder.java:91)
   at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:138)
   at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76)
   at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103)
   at com.sun.proxy.$Proxy97.querySpuDetailBySpuId(Unknown Source)
   at XXXX(IndexService.java:41)
   at XXXX(ElasticsearchTest.java:63)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
   at

...

异常排查：

feign.FeignException: status 404 reading XXXClient#XXMethod(String)

即当get请求的入参为null时，如本例中的orderNumber没有传参，feign调用时会报404！