我对JHipster很新，我按照他们的指示创建了一个新的应用程序。该应用程序已创建，作为Maven项目导入STS，我对其进行了更新。
但是，一旦我尝试通过Boot Dashboard启动它，我得到这个输出：
2016-12-07 16:43:14.887 INFO 6396 --- [ restartedMain] com.mycompany.myapp.MdcApp : Starting MdcApp on PC981 with PID 6396 (C:\Users\lvuillaume\Desktop\mdc\target\classes started by lvuillaume in C:\Users\lvuillaume\Desktop\mdc)
2016-12-07 16:43:14.890 DEBUG 6396 --- [ restartedMain] com.mycompany.myapp.MdcApp : Running with Spring Boot v1.4.2.RELEASE, Spring v4.3.4.RELEASE
2016-12-07 16:43:14.891 INFO 6396 --- [ restartedMain] com.mycompany.myapp.MdcApp : The following profiles are active: swagger,dev
2016-12-07 16:43:14.972 DEBUG 6396 --- [kground-preinit] org.jboss.logging : Logging Provider: org.jboss.logging.Slf4jLoggerProvider found via system property
2016-12-07 16:43:18.499 DEBUG 6396 --- [ restartedMain] c.m.myapp.config.AsyncConfiguration : Creating Async Task Executor
2016-12-07 16:43:19.041 DEBUG 6396 --- [ restartedMain] c.m.myapp.config.MetricsConfiguration : Registering JVM gauges
2016-12-07 16:43:19.059 DEBUG 6396 --- [ restartedMain] c.m.myapp.config.MetricsConfiguration : Initializing Metrics JMX reporting
2016-12-07 16:43:19.960 WARN 6396 --- [ restartedMain] io.undertow.websockets.jsr : UT026009: XNIO worker was not set on WebSocketDeploymentInfo, the default worker will be used
2016-12-07 16:43:19.961 WARN 6396 --- [ restartedMain] io.undertow.websockets.jsr : UT026010: Buffer pool was not set on WebSocketDeploymentInfo, the default pool will be used
2016-12-07 16:43:20.436 INFO 6396 --- [ restartedMain] c.mycompany.myapp.config.WebConfigurer : Web application configuration, using profiles: [swagger, dev]
2016-12-07 16:43:20.437 DEBUG 6396 --- [ restartedMain] c.mycompany.myapp.config.WebConfigurer : Initializing Metrics registries
2016-12-07 16:43:20.442 DEBUG 6396 --- [ restartedMain] c.mycompany.myapp.config.WebConfigurer : Registering Metrics Filter
2016-12-07 16:43:20.442 DEBUG 6396 --- [ restartedMain] c.mycompany.myapp.config.WebConfigurer : Registering Metrics Servlet
2016-12-07 16:43:20.445 INFO 6396 --- [ restartedMain] c.mycompany.myapp.config.WebConfigurer : Web application fully configured
2016-12-07 16:43:20.491 INFO 6396 --- [ restartedMain] com.mycompany.myapp.MdcApp : Running with Spring profile(s) : [swagger, dev]
2016-12-07 16:43:20.579 DEBUG 6396 --- [ restartedMain] c.m.myapp.config.CacheConfiguration : No cache
2016-12-07 16:43:24.805 DEBUG 6396 --- [ restartedMain] c.m.m.c.apidoc.SwaggerConfiguration : Starting Swagger
2016-12-07 16:43:24.816 DEBUG 6396 --- [ restartedMain] c.m.m.c.apidoc.SwaggerConfiguration : Started Swagger in 10 ms
2016-12-07 16:43:24.849 DEBUG 6396 --- [ restartedMain] c.m.myapp.config.DatabaseConfiguration : Configuring Mongobee
2016-12-07 16:43:24.854 INFO 6396 --- [ restartedMain] com.github.mongobee.Mongobee : Mongobee has started the data migration sequence..
2016-12-07 16:43:54.876 WARN 6396 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongobee' defined in class path resource [com/mycompany/myapp/config/DatabaseConfiguration.class]: Invocation of init method failed; nested exception is com.mongodb.MongoTimeoutException: Timed out after 30000 ms while waiting for a server that matches ReadPreferenceServerSelector{readPreference=primary}. Client view of cluster state is {type=UNKNOWN, servers=[{address=localhost:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketOpenException: Exception opening socket}, caused by {java.net.ConnectException: Connection refused: connect}}]
2016-12-07 16:43:54.883 INFO 6396 --- [ restartedMain] c.m.myapp.config.CacheConfiguration : Closing Cache Manager
2016-12-07 16:43:54.905 ERROR 6396 --- [ restartedMain] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongobee' defined in class path resource [com/mycompany/myapp/config/DatabaseConfiguration.class]: Invocation of init method failed; nested exception is com.mongodb.MongoTimeoutException: Timed out after 30000 ms while waiting for a server that matches ReadPreferenceServerSelector{readPreference=primary}. Client view of cluster state is {type=UNKNOWN, servers=[{address=localhost:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketOpenException: Exception opening socket}, caused by {java.net.ConnectException: Connection refused: connect}}]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1583)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:754)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
at com.mycompany.myapp.MdcApp.main(MdcApp.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: com.mongodb.MongoTimeoutException: Timed out after 30000 ms while waiting for a server that matches ReadPreferenceServerSelector{readPreference=primary}. Client view of cluster state is {type=UNKNOWN, servers=[{address=localhost:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketOpenException: Exception opening socket}, caused by {java.net.ConnectException: Connection refused: connect}}]
at com.mongodb.connection.BaseCluster.createTimeoutException(BaseCluster.java:369)
at com.mongodb.connection.BaseCluster.selectServer(BaseCluster.java:101)
at com.mongodb.binding.ClusterBinding$ClusterBindingConnectionSource.<init>(ClusterBinding.java:75)
at com.mongodb.binding.ClusterBinding$ClusterBindingConnectionSource.<init>(ClusterBinding.java:71)
at com.mongodb.binding.ClusterBinding.getReadConnectionSource(ClusterBinding.java:63)
at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:210)
at com.mongodb.operation.FindOperation.execute(FindOperation.java:482)
at com.mongodb.operation.FindOperation.execute(FindOperation.java:79)
at com.mongodb.Mongo.execute(Mongo.java:772)
at com.mongodb.Mongo$2.execute(Mongo.java:759)
at com.mongodb.DBCollection.findOne(DBCollection.java:777)
at com.mongodb.DBCollection.findOne(DBCollection.java:747)
at com.mongodb.DBCollection.findOne(DBCollection.java:694)
at com.github.mongobee.dao.ChangeEntryIndexDao.findRequiredChangeAndAuthorIndex(ChangeEntryIndexDao.java:26)
at com.github.mongobee.dao.ChangeEntryDao.ensureChangeLogCollectionIndex(ChangeEntryDao.java:75)
at com.github.mongobee.dao.ChangeEntryDao.connectMongoDb(ChangeEntryDao.java:34)
at com.github.mongobee.Mongobee.execute(Mongobee.java:135)
at com.github.mongobee.Mongobee.afterPropertiesSet(Mongobee.java:117)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1642)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579)
... 19 common frames omitted
我试图创建一个类似的项目，但没有Mongodb，它工作。
此错误表示连接到您的数据库时出错，它在您的堆栈跟踪中确认：
Timed out after 30000 ms while waiting for a server
请在application-dev.properties下的application-dev.yml或src/main/resources/config/文件中仔细检查您的数据库配置。
根据您是使用YAML还是JSON作为属性定义文件，请仔细检查数据库配置：
Yamla：
spring:
data:
mongodb:
host: <your_host_address>
port: <your_port>
database: <database_name>
JSON：
spring.data.mongodb.host=<your_host_address>
spring.data.mongodb.port=<your_port>
spring.data.mongodb.database=<database_name>
用MongoDb创建一个新的JHipster项目后，我遇到了同样的错误。
在运行mvnw之前（在Windows上）我忘了运行MongoDb本身。
所以在新的命令提示符下运行mongod.exe，然后运行mvnw为我解决了这个问题。