解决：java.lang.IllegalStateException: Service id not legal hostname (${feign.client.fangShopCore.name}

1、操作

springboot启动项目的时候

2、现象（错误信息）

2020-09-29 10:30:59.999  INFO 3680 --- [           main] EnableEncryptablePropertiesConfiguration : Bootstraping jasypt-string-boot auto configuration in context: application-1
2020-09-29 10:30:59.999  INFO 3680 --- [           main] com.eju.fangshop.merchant.Application    : The following profiles are active: dev
2020-09-29 10:31:01.127 ERROR 3680 --- [           main] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalStateException: Service id not legal hostname (${feign.client.fangShopCore.name})
	at org.springframework.util.Assert.state(Assert.java:73)
	at org.springframework.cloud.openfeign.FeignClientsRegistrar.getName(FeignClientsRegistrar.java:104)
	at org.springframework.cloud.openfeign.FeignClientsRegistrar.getName(FeignClientsRegistrar.java:280)
	at org.springframework.cloud.openfeign.FeignClientsRegistrar.registerFeignClient(FeignClientsRegistrar.java:234)
	at org.springframework.cloud.openfeign.FeignClientsRegistrar.registerFeignClients(FeignClientsRegistrar.java:220)
	at org.springframework.cloud.openfeign.FeignClientsRegistrar.registerBeanDefinitions(FeignClientsRegistrar.java:145)
	at org.springframework.context.annotation.ImportBeanDefinitionRegistrar.registerBeanDefinitions(ImportBeanDefinitionRegistrar.java:86)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.lambda$loadBeanDefinitionsFromRegistrars$1(ConfigurationClassBeanDefinitionReader.java:385)
	at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromRegistrars(ConfigurationClassBeanDefinitionReader.java:384)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:148)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:120)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:331)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
	at com.eju.fangshop.merchant.Application.main(Application.java:24)

Disconnected from the target VM, address: '127.0.0.1:59445', transport: 'socket'

Process finished with exit code 1

3、原因

feign不支持"_"，改成"-"

4、解决

@FeignClient(value = "${feign.client.config.fangshop-core.name}", url = "${feign.client.config.fangshop-core.url}", configuration = {OAuth2FeignConguration.class, CatFeignConfiguration.class})
public interface CityApi extends ICityController {
}