问题如何启动spring-boot应用而不依赖数据库？在MySQL下降时解决如何启动Spring-Boot应用程序。
可以使用MongoDB做同样的事情？
在Spring Boot应用程序属性中找不到任何可以支持它的属性。
Spring-boot Config
spring.data.mongodb.uri: mongodb://localhost:27017/measurements-db
我得到以下stacktrace
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'diseaseRepository': Invocation of init method failed; nested exception is org.springframework.dao.DataAccessResourceFailureException: Timed out after 10000 ms while waiting for a server that matches AnyServerSelector{}. Client view of cluster state is {type=Unknown, servers=[{address=docker.me:27017, type=Unknown, state=Connecting, exception={com.mongodb.MongoException$Network: Exception opening the socket}, caused by {java.net.ConnectException: Connection refused}}]; nested exception is com.mongodb.MongoTimeoutException: Timed out after 10000 ms while waiting for a server that matches AnyServerSelector{}. Client view of cluster state is {type=Unknown, servers=[{address=docker.me:27017, type=Unknown, state=Connecting, exception={com.mongodb.MongoException$Network: Exception opening the socket}, caused by {java.net.ConnectException: Connection refused}}]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1192) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1116) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
... 24 common frames omitted
Caused by: org.springframework.dao.DataAccessResourceFailureException: Timed out after 10000 ms while waiting for a server that matches AnyServerSelector{}. Client view of cluster state is {type=Unknown, servers=[{address=docker.me:27017, type=Unknown, state=Connecting, exception={com.mongodb.MongoException$Network: Exception opening the socket}, caused by {java.net.ConnectException: Connection refused}}]; nested exception is com.mongodb.MongoTimeoutException: Timed out after 10000 ms while waiting for a server that matches AnyServerSelector{}. Client view of cluster state is {type=Unknown, servers=[{address=docker.me:27017, type=Unknown, state=Connecting, exception={com.mongodb.MongoException$Network: Exception opening the socket}, caused by {java.net.ConnectException: Connection refused}}]
at org.springframework.data.mongodb.core.MongoExceptionTranslator.translateExceptionIfPossible(MongoExceptionTranslator.java:75) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
at org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.createIndex(MongoPersistentEntityIndexCreator.java:162) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
at org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.checkForAndCreateIndexes(MongoPersistentEntityIndexCreator.java:133) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
at org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.checkForIndexes(MongoPersistentEntityIndexCreator.java:125) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
at org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.onApplicationEvent(MongoPersistentEntityIndexCreator.java:109) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
at org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.onApplicationEvent(MongoPersistentEntityIndexCreator.java:51) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:166) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:381) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:335) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:326) ~[spring-data-commons-1.11.4.RELEASE.jar:na]
at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:179) ~[spring-data-commons-1.11.4.RELEASE.jar:na]
at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:139) ~[spring-data-commons-1.11.4.RELEASE.jar:na]
at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:66) ~[spring-data-commons-1.11.4.RELEASE.jar:na]
at org.springframework.data.mongodb.repository.support.MongoRepositoryFactory.getEntityInformation(MongoRepositoryFactory.java:118) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
at org.springframework.data.mongodb.repository.support.MongoRepositoryFactory.getTargetRepository(MongoRepositoryFactory.java:92) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:185) ~[spring-data-commons-1.11.4.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:251) ~[spring-data-commons-1.11.4.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:237) ~[spring-data-commons-1.11.4.RELEASE.jar:na]
at org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean.afterPropertiesSet(MongoRepositoryFactoryBean.java:108) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
... 34 common frames omitted
Caused by: com.mongodb.MongoTimeoutException: Timed out after 10000 ms while waiting for a server that matches AnyServerSelector{}. Client view of cluster state is {type=Unknown, servers=[{address=docker.me:27017, type=Unknown, state=Connecting, exception={com.mongodb.MongoException$Network: Exception opening the socket}, caused by {java.net.ConnectException: Connection refused}}]
at com.mongodb.BaseCluster.getServer(BaseCluster.java:82) ~[mongo-java-driver-2.13.3.jar:na]
at com.mongodb.DBTCPConnector.getServer(DBTCPConnector.java:664) ~[mongo-java-driver-2.13.3.jar:na]
at com.mongodb.DBTCPConnector.access$500(DBTCPConnector.java:40) ~[mongo-java-driver-2.13.3.jar:na]
at com.mongodb.DBTCPConnector$MyPort.getConnection(DBTCPConnector.java:513) ~[mongo-java-driver-2.13.3.jar:na]
at com.mongodb.DBTCPConnector$MyPort.get(DBTCPConnector.java:456) ~[mongo-java-driver-2.13.3.jar:na]
at com.mongodb.DBTCPConnector.getPrimaryPort(DBTCPConnector.java:415) ~[mongo-java-driver-2.13.3.jar:na]
at com.mongodb.DBCollectionImpl.createIndex(DBCollectionImpl.java:378) ~[mongo-java-driver-2.13.3.jar:na]
at com.mongodb.DBCollection.createIndex(DBCollection.java:597) ~[mongo-java-driver-2.13.3.jar:na]
at org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.createIndex(MongoPersistentEntityIndexCreator.java:142) ~[spring-data-mongodb-1.8.4.RELEASE.jar:na]
... 54 common frames omitted
这是 3 几年后...但是现在是可能的。
问题是启用了自动索引创建。使用Spring Boot 2.2，现在可以禁用并将任何必要的索引创建推迟到启动时的ApplicationReadyEvent侦听器。
您需要更改的特定属性是spring.data.mongodb.auto-index-creation并设置false（这将是将来版本中的默认值）。
以下是可以（并且应该！）取代的ApplicationdreadyEvent侦听器的示例。
@EventListener(ApplicationReadyEvent.class)
public void initIndicesAfterStartup() {
IndexOperations indexOps = mongoTemplate.indexOps(DomainType.class);
IndexResolver resolver = new MongoPersistentEntityIndexResolver(mongoMappingContext);
resolver.resolveIndexFor(DomainType.class).forEach(indexOps::ensureIndex);
}