title: UnknownHostException: failed to resolve 'my-redis-host' after 6 queries after switching from Jedis to Redisson
body: <p>After switching from Jedis to Redisson I have an issue which looks similar</p>
  <ul>
  <li><a href="https://github.com/redisson/redisson/issues/1693" rel="nofollow noreferrer">https://github.com/redisson/redisson/issues/1693</a></li>
  <li><a href="https://github.com/redisson/redisson/issues/1486" rel="nofollow noreferrer">https://github.com/redisson/redisson/issues/1486</a></li>
  <li><a href="https://github.com/redisson/redisson/issues/1646" rel="nofollow noreferrer">https://github.com/redisson/redisson/issues/1646</a></li>
  <li><a href="https://github.com/redisson/redisson/issues/1625" rel="nofollow noreferrer">https://github.com/redisson/redisson/issues/1625</a></li>
  </ul>
  <p>I tried all solutions and workarounds from comments of issues I mentioned but I still experience</p>
  <pre><code>     [java] 20:46:08.537 ERROR [main] o.s.web.context.ContextLoader (ContextLoader.java:313): Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'MyRedissonConnectionFactory': Invocation of ini
  t method failed; nested exception is java.net.UnknownHostException: failed to resolve 'my-redis-host' after 6 queries
       [java]     at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:160)
       [java]     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:416)
       [java]     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1788)
       [java]     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595)
       [java]     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
       [java]     at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
       [java]     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
       [java]     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
       [java]     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
       [java]     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879)
       [java]     at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
       [java]     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
       [java]     at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401)
       [java]     at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292)
       [java]     at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
       [java]     at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:890)
       [java]     at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:558)
       [java]     at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:853)
       [java]     at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:370)
       [java]     at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1497)
       [java]     at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1459)
       [java]     at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:785)
       [java]     at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:287)
       [java]     at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545)
       [java]     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
       [java]     at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
       [java]     at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
       [java]     at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
       [java]     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
       [java]     at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
       [java]     at org.eclipse.jetty.server.Server.start(Server.java:419)
       [java]     at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:108)
       [java]     at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
       [java]     at org.eclipse.jetty.server.Server.doStart(Server.java:386)
       [java]     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
       [java]     at my.WebAppRunner.startServer(WebAppRunner.java:127)
       [java]     Main.main(Main.java:63)
       [java] Caused by: java.net.UnknownHostException: failed to resolve 'my-redis-host' after 6 queries
       [java]     at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:925)
       [java]     at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:884)
       [java]     at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:356)
       [java]     at io.netty.resolver.dns.DnsResolveContext.onResponse(DnsResolveContext.java:519)
       [java]     at io.netty.resolver.dns.DnsResolveContext.access$400(DnsResolveContext.java:64)
       [java]     at io.netty.resolver.dns.DnsResolveContext$2.operationComplete(DnsResolveContext.java:400)
       [java]     at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:577)
       [java]     at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:570)
       [java]     at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:549)
       [java]     at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:490)
       [java]     at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:615)
       [java]     at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:604)
       [java]     at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:104)
       [java]     at io.netty.resolver.dns.DnsQueryContext.trySuccess(DnsQueryContext.java:201)
       [java]     at io.netty.resolver.dns.DnsQueryContext.finish(DnsQueryContext.java:193)
       [java]     at io.netty.resolver.dns.DnsNameResolver$DnsResponseHandler.channelRead(DnsNameResolver.java:1217)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
       [java]     at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
       [java]     at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       [java]     at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
       [java]     at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:93)
       [java]     at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
       [java]     at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
       [java]     at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
       [java]     at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
       [java]     at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
       [java]     at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
       [java]     at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
       [java]     at java.lang.Thread.run(Thread.java:745)
       [java]
       [java] 20:46:08.606 WARN [main] o.e.jetty.webapp.WebAppContext (WebAppContext.java:554): Failed startup of context o.e.j.w.WebAppContext@19f1f330{/,} org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myRedissonConnectionFactory': Invocation of init method failed; nested except
  ion is java.net.UnknownHostException: failed to resolve 'my-redis-host' after 6 queries
       [java]     at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:160)
       [java]     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:416)
       [java]     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1788)
       [java]     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595)
       [java]     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
       [java]     at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
       [java]     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
       [java]     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
       [java]     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
       [java]     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879)
       [java]     at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
       [java]     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
       [java]     at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401)
       [java]     at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292)
       [java]     at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
       [java]     at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:890)
       [java]     at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:558)
       [java]     at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:853)
       [java]     at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:370)
       [java]     at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1497)
       [java]     at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1459)
       [java]     at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:785)
       [java]     at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:287)
       [java]     at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545)
       [java]     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
       [java]     at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
       [java]     at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
       [java]     at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
       [java]     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
       [java]     at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
       [java]     at org.eclipse.jetty.server.Server.start(Server.java:419)
       [java]     at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:108)
       [java]     at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
       [java]     at org.eclipse.jetty.server.Server.doStart(Server.java:386)
       [java]     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
       [java]     at my.WebAppRunner.startServer(WebAppRunner.java:127)
       [java]     at my.Main.main(Main.java:63)
       [java] Caused by: java.net.UnknownHostException: failed to resolve 'my-redis-host' after 6 queries
       [java]     at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:925)
       [java]     at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:884)
       [java]     at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:356)
       [java]     at io.netty.resolver.dns.DnsResolveContext.onResponse(DnsResolveContext.java:519)
       [java]     at io.netty.resolver.dns.DnsResolveContext.access$400(DnsResolveContext.java:64)
       [java]     at io.netty.resolver.dns.DnsResolveContext$2.operationComplete(DnsResolveContext.java:400)
       [java]     at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:577)
       [java]     at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:570)
       [java]     at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:549)
       [java]     at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:490)
       [java]     at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:615)
       [java]     at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:604)
       [java]     at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:104)
       [java]     at io.netty.resolver.dns.DnsQueryContext.trySuccess(DnsQueryContext.java:201)
       [java]     at io.netty.resolver.dns.DnsQueryContext.finish(DnsQueryContext.java:193)
       [java]     at io.netty.resolver.dns.DnsNameResolver$DnsResponseHandler.channelRead(DnsNameResolver.java:1217)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
       [java]     at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
       [java]     at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       [java]     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       [java]     at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
       [java]     at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:93)
       [java]     at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
       [java]     at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
       [java]     at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
       [java]     at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
       [java]     at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
       [java]     at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
       [java]     at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
       [java]     at java.lang.Thread.run(Thread.java:745)
  </code></pre>
  <p>my config looks like:</p>
  <pre><code>String host = &quot;my-redis-host&quot;;
  int port = 6379;
  Config config = new Config();
  config.useSingleServer()
          .setAddress(String.format(&quot;redis://%s:%s&quot;, host, port))
          .setPassword(&quot;password&quot;);
  
  RedissonClient redissonClient = Redisson.create(config);
  return new RedissonConnectionFactory(redissonClient);
  </code></pre>
  <p>service definition in <code>docker-compose</code> file:</p>
  <pre><code>my-redis-host:
     image: 'bitnami/redis:latest'
     hostname: redis
     container_name: contaner_my-redis-host
     environment:
       - REDIS_PASSWORD=password
     ports:
       - '6379:6379'
  </code></pre>
  <p>versions:</p>
  <pre><code>compile group: 'org.redisson', name: 'redisson-spring-data-21', version: '3.12.0'
  compile group: 'io.netty', name: 'netty-common', version: '4.1.47.Final'
  </code></pre>
  <p>What do I wrong ? How to fix it ?</p>