com.netflix.hystrix.exception.HystrixRuntimeException& feign.FeignException: status 404 reading

背景：spring cloud 项目中A服务中调用B服务接口报错。

（方法：DmmService.getBySimpleCode(name) ）

02-24 14:36:26.840 ERROR [com.elephant.filter.AccessFilter] - 服务异常：{}
com.netflix.hystrix.exception.HystrixRuntimeException: DmmService#getBySimpleCode(String) failed and no fallback available.
        at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:819)
        at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:804)
        at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:140)
        at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
        at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
        at com.netflix.hystrix.AbstractCommand$DeprecatedOnFallbackHookApplication$1.onError(AbstractCommand.java:1472)
        at com.netflix.hystrix.AbstractCommand$FallbackHookApplication$1.onError(AbstractCommand.java:1397)
        at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
        at rx.observers.Subscribers$5.onError(Subscribers.java:230)
        at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:44)
        at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:28)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:142)
        at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
        at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
        at com.netflix.hystrix.AbstractCommand$HystrixObservableTimeoutOperator$2.onError(AbstractCommand.java:1194)
        at rx.internal.operators.OperatorSubscribeOn$1$1.onError(OperatorSubscribeOn.java:59)
        at rx.observers.Subscribers$5.onError(Subscribers.java:230)
        at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
        at rx.observers.Subscribers$5.onError(Subscribers.java:230)
        at com.netflix.hystrix.AbstractCommand$DeprecatedOnRunHookApplication$1.onError(AbstractCommand.java:1431)
        at com.netflix.hystrix.AbstractCommand$ExecutionHookApplication$1.onError(AbstractCommand.java:1362)
        at rx.observers.Subscribers$5.onError(Subscribers.java:230)
        at rx.observers.Subscribers$5.onError(Subscribers.java:230)
        at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:44)
        at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:28)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
        at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.java:56)
        at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.java:47)
        at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction.call(HystrixContexSchedulerAction.java:69)
        at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: feign.FeignException: status 404 reading DmmService#getBySimpleCode(String)
        at feign.FeignException.errorStatus(FeignException.java:62)
        at feign.codec.ErrorDecoder$Default.decode(ErrorDecoder.java:91)
        at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:138)
        at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76)
        at feign.hystrix.HystrixInvocationHandler$1.run(HystrixInvocationHandler.java:108)
        at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302)
        at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
        ... 26 common frames omitted

刚开始分析的时候没注意到“404”这个错误，只从HystrixRuntimeException分析，

首先HystrixRuntimeException：failed and no fallback available 大多是Eureka的问题（如果是超时的问题可以百度下）：

1）确认下程序是否改动过，jar包一个月内没有更新过，日志也是半个月内的。

2）查询下DmmService所在的服务是否已注册到注册中心（Eureka）中。排查没问题。

3）如果注册中心没有问题，重启下Eureka服务。（重启后依然报错）

4）重启A,B服务（依然报错）

后来注意到错误信息404：Caused by: feign.FeignException: status 404 reading DmmService#getBySimpleCode(String)

报404 就是路径有问题，但是看代码和配置文件都是正常的没什么问题，解决了很久，

最后跟生产环境对比发现不知道谁把jar文件启动错了（同一目录下有两个jar包，两个jar基本是一样的，但是有细微差别，o(╥﹏╥)o，我们查程序是否有过改动的时候没有想到这儿，它报404就是因为错误的jar包里根本没有那个方法(ಥ_ಥ)  ~）

世间错误千千万，它虐你千百遍，你待它如初恋~