I generated my first JHipster app. I followed the official step-by-step guide and made no changes to the generated project. However, when I start the app (i.e., run main from the IDE or execute ./gradlew) the following error is repeated a few times:
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
And finally, I get the error (pardon the long paste):
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.<init>(ZkClient.java:156)
at org.I0Itec.zkclient.ZkClient.<init>(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
I'm running with MacOS, Java 8 and using IntelliJ Community Edition. From the video tutorial it seems I should be able to run the app out of the box. What am I missing?
As explained in the doc, you must start Kafka. A Docker Compose configuration file is generated and you can start Kafka with the command:
docker-compose -f src/main/docker/kafka.yml up -d
来源：https://stackoverflow.com/questions/48268825/new-jhipster-application-crashing-when-started