. lang。IllegalStateException:方法[方法名]只能包含一个方法字段。发现:[]

Caused by: java.lang.IllegalStateException: Method findByApplicationName can only contain 1 method field. Found: []
    at feign.Util.checkState(Util.java:117) ~[feign-core-8.15.1.jar:8.15.1]
    at org.springframework.cloud.netflix.feign.support.SpringMvcContract.checkOne(SpringMvcContract.java:180) ~[spring-cloud-netflix-core-1.1.0.BUILD-SNAPSHOT.jar:1.1.0.BUILD-SNAPSHOT]
    at org.springframework.cloud.netflix.feign.support.SpringMvcContract.processAnnotationOnMethod(SpringMvcContract.java:143) ~[spring-cloud-netflix-core-1.1.0.BUILD-SNAPSHOT.jar:1.1.0.BUILD-SNAPSHOT]
    at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:92) ~[feign-core-8.15.1.jar:8.15.1]
    at org.springframework.cloud.netflix.feign.support.SpringMvcContract.parseAndValidateMetadata(SpringMvcContract.java:100) ~[spring-cloud-netflix-core-1.1.0.BUILD-SNAPSHOT.jar:1.1.0.BUILD-SNAPSHOT]
    at feign.Contract$BaseContract.parseAndValidatateMetadata(Contract.java:61) ~[feign-core-8.15.1.jar:8.15.1]
    at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:140) ~[feign-core-8.15.1.jar:8.15.1]
    at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:58) ~[feign-core-8.15.1.jar:8.15.1]
    at feign.Feign$Builder.target(Feign.java:198) ~[feign-core-8.15.1.jar:8.15.1]
    at org.springframework.cloud.netflix.feign.FeignClientFactoryBean$DefaultTargeter.target(FeignClientFactoryBean.java:203) ~[spring-cloud-netflix-core-1.1.0.BUILD-SNAPSHOT.jar:1.1.0.BUILD-SNAPSHOT]
    at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:153) ~[spring-cloud-netflix-core-1.1.0.BUILD-SNAPSHOT.jar:1.1.0.BUILD-SNAPSHOT]
    at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:173) ~[spring-cloud-netflix-core-1.1.0.BUILD-SNAPSHOT.jar:1.1.0.BUILD-SNAPSHOT]
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    ... 40 common frames omitted
Caused by: java.lang.IllegalStateException: Met