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java.lang.UnsupportedOperationException: null	at java.util.AbstractList.add(AbstractList.java:148)	at java.util.AbstractList.add(AbstractList.java:108)	at java.util.AbstractCollection.addAll(AbstractCollection.java:344)	at org.springframework.cloud.contract.stubrunner.spring.cloud.StubRunnerDiscoveryClient.getServices(StubRunnerDiscoveryClient.java:139)	at org.springframework.cloud.netflix.zuul.filters.discovery.DiscoveryClientRouteLocator.locateRoutes(DiscoveryClientRouteLocator.java:105)	at org.springframework.cloud.netflix.zuul.filters.discovery.DiscoveryClientRouteLocator.locateRoutes(DiscoveryClientRouteLocator.java:43)	at org.springframework.cloud.netflix.zuul.filters.SimpleRouteLocator.doRefresh(SimpleRouteLocator.java:152)	at org.springframework.cloud.netflix.zuul.filters.discovery.DiscoveryClientRouteLocator.refresh(DiscoveryClientRouteLocator.java:155)	at org.springframework.cloud.netflix.zuul.web.ZuulHandlerMapping.setDirty(ZuulHandlerMapping.java:61)	at org.springframework.cloud.netflix.zuul.ZuulConfiguration$ZuulRefreshListener.onApplicationEvent(ZuulConfiguration.java:180)	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:166)	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:382)	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:388)	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:336)	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:877)	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544)	at org.springframework.cloud.context.named.NamedContextFactory.createContext(NamedContextFactory.java:110)	at org.springframework.cloud.context.named.NamedContextFactory.getContext(NamedContextFactory.java:79)	at org.springframework.cloud.context.named.NamedContextFactory.getInstance(NamedContextFactory.java:115)	at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.getOptional(FeignClientFactoryBean.java:139)	at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.feign(FeignClientFactoryBean.java:84)	at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:157)	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168)