title: New JHipster application crashing when started
body: <p>I generated my first <code>JHipster</code> app. I followed the official <a href="http://www.jhipster.tech/creating-an-app/" rel="nofollow noreferrer">step-by-step</a> guide and made no changes to the generated project. However, when I start the app (i.e., run <code>main</code> from the IDE or execute <code>./gradlew</code>) the following error is repeated a few times:</p>
  
  <pre><code>java.net.ConnectException: Connection refused
      at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
      at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
      at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
      at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1141)
  
  2018-01-15 20:22:15.734  WARN 29518 --- [localhost:2181)] org.apache.zookeeper.ClientCnxn          : Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
  </code></pre>
  
  <p>And finally, I get the error (pardon the long paste):</p>
  
  <pre><code>org.springframework.context.ApplicationContextException: Failed to start bean 'outputBindingLifecycle'; nested exception is org.springframework.cloud.stream.binder.BinderException: Exception thrown while building outbound endpoint
      at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178)
      at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:50)
      at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:348)
      at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:151)
      at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:114)
      at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:880)
      at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:144)
      at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
      at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
      at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
      at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
      at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
      at com.liga.sample.sampleApp.main(sampleApp.java:68)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
  Caused by: org.springframework.cloud.stream.binder.BinderException: Exception thrown while building outbound endpoint
      at org.springframework.cloud.stream.binder.AbstractMessageChannelBinder.doBindProducer(AbstractMessageChannelBinder.java:125)
      at org.springframework.cloud.stream.binder.AbstractMessageChannelBinder.doBindProducer(AbstractMessageChannelBinder.java:57)
      at org.springframework.cloud.stream.binder.AbstractBinder.bindProducer(AbstractBinder.java:152)
      at org.springframework.cloud.stream.binding.BindingService.bindProducer(BindingService.java:124)
      at org.springframework.cloud.stream.binding.BindableProxyFactory.bindOutputs(BindableProxyFactory.java:238)
      at org.springframework.cloud.stream.binding.OutputBindingLifecycle.start(OutputBindingLifecycle.java:57)
      at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:175)
      ... 17 common frames omitted
  Caused by: org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within timeout: 10000
      at org.I0Itec.zkclient.ZkClient.connect(ZkClient.java:1232)
      at org.I0Itec.zkclient.ZkClient.&lt;init&gt;(ZkClient.java:156)
      at org.I0Itec.zkclient.ZkClient.&lt;init&gt;(ZkClient.java:130)
      at kafka.utils.ZkUtils$.createZkClientAndConnection(ZkUtils.scala:76)
      at kafka.utils.ZkUtils$.apply(ZkUtils.scala:58)
      at kafka.utils.ZkUtils.apply(ZkUtils.scala)
      at org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner.createTopicAndPartitions(KafkaTopicProvisioner.java:171)
      at org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner.createTopicsIfAutoCreateEnabledAndAdminUtilsPresent(KafkaTopicProvisioner.java:153)
      at org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner.provisionProducerDestination(KafkaTopicProvisioner.java:108)
      at org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner.provisionProducerDestination(KafkaTopicProvisioner.java:60)
      at org.springframework.cloud.stream.binder.AbstractMessageChannelBinder.doBindProducer(AbstractMessageChannelBinder.java:110)
      ... 23 common frames omitted
  </code></pre>
  
  <p>I'm running with MacOS, Java 8 and using IntelliJ Community Edition. From the <a href="http://www.jhipster.tech/video-tutorial/" rel="nofollow noreferrer">video tutorial</a> it seems I should be able to run the app out of the box. What am I missing?</p>