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java.lang.UnsupportedOperationException: No fallback available. at com.netflix.hystrix.HystrixCommand.getFallback(HystrixCommand.java:284)[hystrix-core-1.5.3.jar:1.5.3] at feign.hystrix.HystrixInvocationHandler$1.getFallback(HystrixInvocationHandler.java:108)[feign-hystrix-8.16.2.jar:8.16.2] at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:307)[hystrix-core-1.5.3.jar:1.5.3] at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:303)[hystrix-core-1.5.3.jar:1.5.3] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)[rxjava-1.1.5.jar:1.1.5] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)[rxjava-1.1.5.jar:1.1.5]