今天在一个基于Spring Cloud开发的项目上添加了一个远程调用另外一个微服务的程序接口,在重新启动程序进行测试时出现如下异常:
Caused by: java.lang.IllegalStateException: RequestParam.value() was empty on parameter 0 at feign.Util.checkState(Util.java:128) at org.springframework.cloud.netflix.feign.annotation.RequestParamParameterProcessor.processArgument(RequestParamParameterProcessor.java:63) at org.springframework.cloud.netflix.feign.support.SpringMvcContract.processAnnotationsOnParameter(SpringMvcContract.java:238) at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:107) at org.springframework.cloud.netflix.feign.support.SpringMvcContract.parseAndValidateMetadata(SpringMvcContract.java:133) at feign.Contract$BaseContract.parseAndValidatateMetadata(Contract.java:64) at feign.hystrix.HystrixDelegatingContract.parseAndValidatateMetadata(HystrixDelegatingContract.java:34) at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:146) at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:53) at feign.hystrix.HystrixFeign$Builder.target(HystrixFeign.java:59) at org.springframework.cloud.netflix.feign.HystrixTargeter.targetWithFallbackFactory(HystrixTargeter.java:78) at org.springframework.cloud.netflix.feign.HystrixTargeter.target(HystrixTargeter.java:53) at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:145) at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:166) at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168) ... 42 common frames omitted
前面还有更长的异常信息,这里只是列出了控制台输出的最底层的异常信息,关键问题在于提示的异常信息是
RequestParam.value() was empty on parameter 0
排查了下代码发现在新添加的通过Feign调用远程微服务接口的参数中在注解@RequestParam上书写错误
ReturnResultObject updateBatchNumberStatus(@RequestParam List<String> billID_list);
是在注解后面缺少了表示参数名的属性值,应该写成如下:
ReturnResultObject updateBatchNumberStatus(@RequestParam("billID_list") List<String> billID_list);
犯了一个小错误,这里记录一下,防止后面再犯这样的错误。
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