今天做项目的时候，feign调用的时候写了一个Hystrix的服务降级处理类，但是运行时报了以下错误：
Ambiguous mapping. Cannot map 'com.guli.vod.feign.VodFeign' method
com.guli.vod.feign.VodFeign#removeVideo(String)
to {DELETE /vod/video/{id}}: There is already 'vodFallback' bean method
com.guli.vod.fallback.VodFallback#removeVideo(String) mapped.
原来写的FeignClient：(这里吐槽一下，Restful api根本没办法设计批量删除的路径嘛，DELETE方法又不推荐使用请求体，而且将资源id放在请求体里也不符合Restful url的语义)
@Component
@FeignClient(value = "service-vod",fallback = VodFallback.class)
@RequestMapping("/vod")
public interface VodFeign {
@DeleteMapping(value = "/video/{id}")
public Result removeVideo(@PathVariable("id") String videoId);
@DeleteMapping(value = "/video/delete-batch")
public Result removeVideoList(@RequestParam("videoIdList") List<String> videoIdList);
}
服务降级处理类：
@Component
public class VodFallback implements VodFeign {
@Override
public Result removeVideo(String videoId) {
return Result.error().msg("time out");
}
@Override
public Result removeVideoList(List<String> videoIdList) {
return Result.error().msg("time out");
}
}
原因在于VodFallback实现了VodFeign接口后，把@RequestMapping的路径映射也继承了过去，而两个类都会注册bean实例对象，就会出现映射冲突的问题，最后我是将FeignClient的@RequestMapping都写在了方法上，成功解决：
@Component
@FeignClient(value = "service-vod",fallback = VodFallback.class)
public interface VodFeign {
@DeleteMapping(value = "/vod/video/{id}")
public Result removeVideo(@PathVariable("id") String videoId);
@DeleteMapping(value = "/vod/video/delete-batch")
public Result removeVideoList(@RequestParam("videoIdList") List<String> videoIdList);
}
原创文章，作者：彭晨涛，如若转载，请注明出处：https://www.codetool.top/article/openfeign%e4%bd%bf%e7%94%a8hystrix%e6%8a%a5%e9%94%99%ef%bc%9aambiguous-mapping-cannot-map-xx-method/
