Caused by: java.lang.IllegalStateException: RequestParam.value() was empty on parameter 0

spring 报错
Caused by: java.lang.IllegalStateException: RequestParam.value() was empty on parameter 0
如下。 @RequestParam 忘记了填值。

package com.sydney.dream.chapter3;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(value = "${remote.eureka.servername}")
@Component
public interface HelloWorldService {
    @PostMapping(value = "/hi")
    String getHello(@RequestParam String name);
}

D:\MyInstall\Install\JDK\DEVINSTALL\bin\java "-javaagent:D:\MyInstall\Install\IDEA\IntelliJ IDEA 2017.1.4\lib\idea_rt.jar=51185:D:\MyInstall\Install\IDEA\IntelliJ IDEA 2017.1.4\bin" -Dfile.encoding=UTF-8 -classpath D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\charsets.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\deploy.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\access-bridge-64.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\cldrdata.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\dnsns.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\jaccess.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\jfxrt.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\localedata.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\nashorn.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\sunec.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\sunjce_provider.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\sunmscapi.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\sunpkcs11.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\ext\zipfs.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\javaws.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\jce.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\jfr.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\jfxswt.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\jsse.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\management-agent.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\plugin.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\resources.jar;D:\MyInstall\Install\JDK\DEVINSTALL\jre\lib\rt.jar;D:\DevDir\PersonNal\Spring-Clound\Chapter-3\target\classes;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-starter-netflix-eureka-client\2.1.1.RELEASE\spring-cloud-starter-netflix-eureka-client-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-starter\2.1.1.RELEASE\spring-cloud-starter-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-context\2.1.1.RELEASE\spring-cloud-context-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\security\spring-security-rsa\1.0.7.RELEASE\spring-security-rsa-1.0.7.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\bouncycastle\bcpkix-jdk15on\1.60\bcpkix-jdk15on-1.60.jar;C:\Users\Edianzu\.m2\repository\org\bouncycastle\bcprov-jdk15on\1.60\bcprov-jdk15on-1.60.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-netflix-hystrix\2.1.1.RELEASE\spring-cloud-netflix-hystrix-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.1.4.RELEASE\spring-boot-autoconfigure-2.1.4.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\boot\spring-boot-starter-aop\2.1.4.RELEASE\spring-boot-starter-aop-2.1.4.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\aspectj\aspectjweaver\1.9.2\aspectjweaver-1.9.2.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-netflix-eureka-client\2.1.1.RELEASE\spring-cloud-netflix-eureka-client-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\com\netflix\eureka\eureka-client\1.9.8\eureka-client-1.9.8.jar;C:\Users\Edianzu\.m2\repository\org\codehaus\jettison\jettison\1.3.7\jettison-1.3.7.jar;C:\Users\Edianzu\.m2\repository\stax\stax-api\1.0.1\stax-api-1.0.1.jar;C:\Users\Edianzu\.m2\repository\com\netflix\netflix-commons\netflix-eventbus\0.3.0\netflix-eventbus-0.3.0.jar;C:\Users\Edianzu\.m2\repository\com\netflix\netflix-commons\netflix-infix\0.3.0\netflix-infix-0.3.0.jar;C:\Users\Edianzu\.m2\repository\commons-jxpath\commons-jxpath\1.3\commons-jxpath-1.3.jar;C:\Users\Edianzu\.m2\repository\joda-time\joda-time\2.10.1\joda-time-2.10.1.jar;C:\Users\Edianzu\.m2\repository\org\antlr\antlr-runtime\3.4\antlr-runtime-3.4.jar;C:\Users\Edianzu\.m2\repository\org\antlr\stringtemplate\3.2.1\stringtemplate-3.2.1.jar;C:\Users\Edianzu\.m2\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;C:\Users\Edianzu\.m2\repository\com\google\code\gson\gson\2.8.5\gson-2.8.5.jar;C:\Users\Edianzu\.m2\repository\org\apache\commons\commons-math\2.2\commons-math-2.2.jar;C:\Users\Edianzu\.m2\repository\com\netflix\archaius\archaius-core\0.7.6\archaius-core-0.7.6.jar;C:\Users\Edianzu\.m2\repository\com\google\guava\guava\16.0\guava-16.0.jar;C:\Users\Edianzu\.m2\repository\javax\ws\rs\jsr311-api\1.1.1\jsr311-api-1.1.1.jar;C:\Users\Edianzu\.m2\repository\com\netflix\servo\servo-core\0.12.21\servo-core-0.12.21.jar;C:\Users\Edianzu\.m2\repository\com\sun\jersey\jersey-core\1.19.1\jersey-core-1.19.1.jar;C:\Users\Edianzu\.m2\repository\com\sun\jersey\jersey-client\1.19.1\jersey-client-1.19.1.jar;C:\Users\Edianzu\.m2\repository\com\sun\jersey\contribs\jersey-apache-client4\1.19.1\jersey-apache-client4-1.19.1.jar;C:\Users\Edianzu\.m2\repository\org\apache\httpcomponents\httpclient\4.5.8\httpclient-4.5.8.jar;C:\Users\Edianzu\.m2\repository\org\apache\httpcomponents\httpcore\4.4.11\httpcore-4.4.11.jar;C:\Users\Edianzu\.m2\repository\commons-codec\commons-codec\1.11\commons-codec-1.11.jar;C:\Users\Edianzu\.m2\repository\com\google\inject\guice\4.1.0\guice-4.1.0.jar;C:\Users\Edianzu\.m2\repository\javax\inject\javax.inject\1\javax.inject-1.jar;C:\Users\Edianzu\.m2\repository\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;C:\Users\Edianzu\.m2\repository\com\github\vlsi\compactmap\compactmap\1.2.1\compactmap-1.2.1.jar;C:\Users\Edianzu\.m2\repository\com\github\andrewoma\dexx\dexx-collections\0.2\dexx-collections-0.2.jar;C:\Users\Edianzu\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\Edianzu\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.8\jackson-core-2.9.8.jar;C:\Users\Edianzu\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.8\jackson-databind-2.9.8.jar;C:\Users\Edianzu\.m2\repository\com\netflix\eureka\eureka-core\1.9.8\eureka-core-1.9.8.jar;C:\Users\Edianzu\.m2\repository\org\codehaus\woodstox\woodstox-core-asl\4.4.1\woodstox-core-asl-4.4.1.jar;C:\Users\Edianzu\.m2\repository\javax\xml\stream\stax-api\1.0-2\stax-api-1.0-2.jar;C:\Users\Edianzu\.m2\repository\org\codehaus\woodstox\stax2-api\3.1.4\stax2-api-3.1.4.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-starter-netflix-archaius\2.1.1.RELEASE\spring-cloud-starter-netflix-archaius-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-netflix-ribbon\2.1.1.RELEASE\spring-cloud-netflix-ribbon-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-netflix-archaius\2.1.1.RELEASE\spring-cloud-netflix-archaius-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\commons-configuration\commons-configuration\1.8\commons-configuration-1.8.jar;C:\Users\Edianzu\.m2\repository\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-starter-netflix-ribbon\2.1.1.RELEASE\spring-cloud-starter-netflix-ribbon-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\com\netflix\ribbon\ribbon\2.3.0\ribbon-2.3.0.jar;C:\Users\Edianzu\.m2\repository\com\netflix\ribbon\ribbon-transport\2.3.0\ribbon-transport-2.3.0.jar;C:\Users\Edianzu\.m2\repository\io\reactivex\rxnetty-contexts\0.4.9\rxnetty-contexts-0.4.9.jar;C:\Users\Edianzu\.m2\repository\io\reactivex\rxnetty-servo\0.4.9\rxnetty-servo-0.4.9.jar;C:\Users\Edianzu\.m2\repository\io\reactivex\rxnetty\0.4.9\rxnetty-0.4.9.jar;C:\Users\Edianzu\.m2\repository\com\netflix\ribbon\ribbon-core\2.3.0\ribbon-core-2.3.0.jar;C:\Users\Edianzu\.m2\repository\com\netflix\ribbon\ribbon-httpclient\2.3.0\ribbon-httpclient-2.3.0.jar;C:\Users\Edianzu\.m2\repository\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;C:\Users\Edianzu\.m2\repository\com\netflix\netflix-commons\netflix-commons-util\0.3.0\netflix-commons-util-0.3.0.jar;C:\Users\Edianzu\.m2\repository\com\netflix\ribbon\ribbon-loadbalancer\2.3.0\ribbon-loadbalancer-2.3.0.jar;C:\Users\Edianzu\.m2\repository\com\netflix\netflix-commons\netflix-statistics\0.1.1\netflix-statistics-0.1.1.jar;C:\Users\Edianzu\.m2\repository\io\reactivex\rxjava\1.3.8\rxjava-1.3.8.jar;C:\Users\Edianzu\.m2\repository\com\netflix\ribbon\ribbon-eureka\2.3.0\ribbon-eureka-2.3.0.jar;C:\Users\Edianzu\.m2\repository\org\slf4j\slf4j-api\1.7.26\slf4j-api-1.7.26.jar;C:\Users\Edianzu\.m2\repository\com\thoughtworks\xstream\xstream\1.4.10\xstream-1.4.10.jar;C:\Users\Edianzu\.m2\repository\xmlpull\xmlpull\1.1.3.1\xmlpull-1.1.3.1.jar;C:\Users\Edianzu\.m2\repository\xpp3\xpp3_min\1.1.4c\xpp3_min-1.1.4c.jar;C:\Users\Edianzu\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.1.4.RELEASE\spring-boot-starter-web-2.1.4.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\boot\spring-boot-starter\2.1.4.RELEASE\spring-boot-starter-2.1.4.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\boot\spring-boot\2.1.4.RELEASE\spring-boot-2.1.4.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.1.4.RELEASE\spring-boot-starter-logging-2.1.4.RELEASE.jar;C:\Users\Edianzu\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\Edianzu\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\Edianzu\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.11.2\log4j-to-slf4j-2.11.2.jar;C:\Users\Edianzu\.m2\repository\org\apache\logging\log4j\log4j-api\2.11.2\log4j-api-2.11.2.jar;C:\Users\Edianzu\.m2\repository\org\slf4j\jul-to-slf4j\1.7.26\jul-to-slf4j-1.7.26.jar;C:\Users\Edianzu\.m2\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;C:\Users\Edianzu\.m2\repository\org\yaml\snakeyaml\1.23\snakeyaml-1.23.jar;C:\Users\Edianzu\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.1.4.RELEASE\spring-boot-starter-json-2.1.4.RELEASE.jar;C:\Users\Edianzu\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.8\jackson-datatype-jdk8-2.9.8.jar;C:\Users\Edianzu\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.8\jackson-datatype-jsr310-2.9.8.jar;C:\Users\Edianzu\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.8\jackson-module-parameter-names-2.9.8.jar;C:\Users\Edianzu\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.1.4.RELEASE\spring-boot-starter-tomcat-2.1.4.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.17\tomcat-embed-core-9.0.17.jar;C:\Users\Edianzu\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.17\tomcat-embed-el-9.0.17.jar;C:\Users\Edianzu\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.17\tomcat-embed-websocket-9.0.17.jar;C:\Users\Edianzu\.m2\repository\org\hibernate\validator\hibernate-validator\6.0.16.Final\hibernate-validator-6.0.16.Final.jar;C:\Users\Edianzu\.m2\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;C:\Users\Edianzu\.m2\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;C:\Users\Edianzu\.m2\repository\com\fasterxml\classmate\1.4.0\classmate-1.4.0.jar;C:\Users\Edianzu\.m2\repository\org\springframework\spring-web\5.1.6.RELEASE\spring-web-5.1.6.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\spring-beans\5.1.6.RELEASE\spring-beans-5.1.6.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\spring-webmvc\5.1.6.RELEASE\spring-webmvc-5.1.6.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\spring-aop\5.1.6.RELEASE\spring-aop-5.1.6.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\spring-context\5.1.6.RELEASE\spring-context-5.1.6.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\spring-expression\5.1.6.RELEASE\spring-expression-5.1.6.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-starter-openfeign\2.1.1.RELEASE\spring-cloud-starter-openfeign-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-openfeign-core\2.1.1.RELEASE\spring-cloud-openfeign-core-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\io\github\openfeign\form\feign-form-spring\3.5.0\feign-form-spring-3.5.0.jar;C:\Users\Edianzu\.m2\repository\io\github\openfeign\form\feign-form\3.5.0\feign-form-3.5.0.jar;C:\Users\Edianzu\.m2\repository\commons-fileupload\commons-fileupload\1.3.3\commons-fileupload-1.3.3.jar;C:\Users\Edianzu\.m2\repository\commons-io\commons-io\2.2\commons-io-2.2.jar;C:\Users\Edianzu\.m2\repository\org\springframework\cloud\spring-cloud-commons\2.1.1.RELEASE\spring-cloud-commons-2.1.1.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\security\spring-security-crypto\5.1.5.RELEASE\spring-security-crypto-5.1.5.RELEASE.jar;C:\Users\Edianzu\.m2\repository\io\github\openfeign\feign-core\10.1.0\feign-core-10.1.0.jar;C:\Users\Edianzu\.m2\repository\io\github\openfeign\feign-slf4j\10.1.0\feign-slf4j-10.1.0.jar;C:\Users\Edianzu\.m2\repository\io\github\openfeign\feign-hystrix\10.1.0\feign-hystrix-10.1.0.jar;C:\Users\Edianzu\.m2\repository\com\netflix\hystrix\hystrix-core\1.5.18\hystrix-core-1.5.18.jar;C:\Users\Edianzu\.m2\repository\org\hdrhistogram\HdrHistogram\2.1.9\HdrHistogram-2.1.9.jar;C:\Users\Edianzu\.m2\repository\org\springframework\spring-core\5.1.6.RELEASE\spring-core-5.1.6.RELEASE.jar;C:\Users\Edianzu\.m2\repository\org\springframework\spring-jcl\5.1.6.RELEASE\spring-jcl-5.1.6.RELEASE.jar com.sydney.dream.FeignClientDemoApp
2019-04-23 09:54:33.385  INFO 11468 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$564e109e] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.4.RELEASE)

2019-04-23 09:54:34.051  INFO 11468 --- [           main] com.sydney.dream.FeignClientDemoApp      : No active profile set, falling back to default profiles: default
2019-04-23 09:54:35.342  INFO 11468 --- [           main] o.s.cloud.context.scope.GenericScope     : BeanFactory id=3fed345d-84d4-30bd-9f30-3f12574194cb
2019-04-23 09:54:35.383  INFO 11468 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'com.sydney.dream.chapter3.HelloWorldService' of type [org.springframework.cloud.openfeign.FeignClientFactoryBean] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-04-23 09:54:35.537  INFO 11468 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$564e109e] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-04-23 09:54:36.396  INFO 11468 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8765 (http)
2019-04-23 09:54:36.447  INFO 11468 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-04-23 09:54:36.447  INFO 11468 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.17]
2019-04-23 09:54:36.738  INFO 11468 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2019-04-23 09:54:36.739  INFO 11468 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2647 ms
2019-04-23 09:54:37.307  WARN 11468 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloWorldController': Unsatisfied dependency expressed through field 'helloWorldService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.sydney.dream.chapter3.HelloWorldService': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: RequestParam.value() was empty on parameter 0
2019-04-23 09:54:37.309  INFO 11468 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2019-04-23 09:54:37.329  INFO 11468 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-04-23 09:54:37.341 ERROR 11468 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloWorldController': Unsatisfied dependency expressed through field 'helloWorldService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.sydney.dream.chapter3.HelloWorldService': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: RequestParam.value() was empty on parameter 0
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
	at com.sydney.dream.FeignClientDemoApp.main(FeignClientDemoApp.java:16) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.sydney.dream.chapter3.HelloWorldService': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: RequestParam.value() was empty on parameter 0
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:178) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:101) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1674) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getObjectForBeanInstance(AbstractAutowireCapableBeanFactory.java:1249) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:257) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1470) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1427) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1210) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	... 19 common frames omitted
Caused by: java.lang.IllegalStateException: RequestParam.value() was empty on parameter 0
	at feign.Util.checkState(Util.java:127) ~[feign-core-10.1.0.jar:na]
	at org.springframework.cloud.openfeign.annotation.RequestParamParameterProcessor.processArgument(RequestParamParameterProcessor.java:65) ~[spring-cloud-openfeign-core-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.cloud.openfeign.support.SpringMvcContract.processAnnotationsOnParameter(SpringMvcContract.java:292) ~[spring-cloud-openfeign-core-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:110) ~[feign-core-10.1.0.jar:na]
	at org.springframework.cloud.openfeign.support.SpringMvcContract.parseAndValidateMetadata(SpringMvcContract.java:188) ~[spring-cloud-openfeign-core-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at feign.Contract$BaseContract.parseAndValidatateMetadata(Contract.java:66) ~[feign-core-10.1.0.jar:na]
	at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:154) ~[feign-core-10.1.0.jar:na]
	at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:52) ~[feign-core-10.1.0.jar:na]
	at feign.Feign$Builder.target(Feign.java:251) ~[feign-core-10.1.0.jar:na]
	at org.springframework.cloud.openfeign.HystrixTargeter.target(HystrixTargeter.java:36) ~[spring-cloud-openfeign-core-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:238) ~[spring-cloud-openfeign-core-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.cloud.openfeign.FeignClientFactoryBean.getTarget(FeignClientFactoryBean.java:267) ~[spring-cloud-openfeign-core-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:247) ~[spring-cloud-openfeign-core-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:171) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	... 30 common frames omitted


Process finished with exit code 1