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java.net.UnknownHostException: http: unknown error	at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)	at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)	at java.net.InetAddress.getAllByName0(InetAddress.java:1276)	at java.net.InetAddress.getAllByName(InetAddress.java:1192)	at java.net.InetAddress.getAllByName(InetAddress.java:1126)	at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:44)	at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:259)	at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:159)	at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144)	at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:131)	at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)	at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:115)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)	at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173)	at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187)	at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123)	at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27)	at com.sun.jersey.api.client.Client.handle(Client.java:652)	at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682)	at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)	at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:509)	at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplicationsInternal(AbstractJerseyEurekaHttpClient.java:194)	at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplications(AbstractJerseyEurekaHttpClient.java:165)	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)	at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73)	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)	at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118)	at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79)	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:119)	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77)	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)	at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1013)	at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:927)	at com.netflix.discovery.DiscoveryClient.(DiscoveryClient.java:441)	at com.netflix.discovery.DiscoveryClient.(DiscoveryClient.java:304)	at com.netflix.discovery.DiscoveryClient.(DiscoveryClient.java:300)	at com.netflix.eureka.EurekaBootStrap.initEurekaServerContext(EurekaBootStrap.java:147)	at com.netflix.eureka.EurekaBootStrap.contextInitialized(EurekaBootStrap.java:96)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4812)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5255)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:939)	at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1812)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)