SpringBoot项目启动报错：PathVariable annotation was empty on param 0.

报错信息

SpringBoot项目启动报错：Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.obstetric.archive.feignclient.DictServiceClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: PathVariable annotation was empty on param 0.

参数传递错误，没有找到参数。

错误代码

@FeignClient(name = "dict", url = "http://localhost:8184/dict",
        fallbackFactory = DictServiceClientFallbackFactory.class)
public interface DictServiceClient {

    @PostMapping("/obstetric/{type}/{label}")
    Integer getValueByTypeAndLabel(@PathVariable String type, @PathVariable String label);

}

在普通的Controller中可以省略路径参数名，但项目中使用了Feign的远程调用，在注解@PathVariable中若不显示指明参数名，就会报错。

修改代码

@FeignClient(name = "dict", url = "http://localhost:8184/dict",
        fallbackFactory = DictServiceClientFallbackFactory.class)
public interface DictServiceClient {

    @PostMapping("/obstetric/{type}/{label}")
    Integer getValueByTypeAndLabel(@PathVariable("type") String type, @PathVariable("label") String label);

}

显式指定路径参数名。