如何在不运行elasticsearch服务器的情况下运行springboot应用程序？

Question

我在我的项目中使用带有MongoDb和Elasticsearch的Springboot。当我的Elasticsearch服务器运行时，我的Springboot应用程序运行良好，但当Elasticsearch服务器停止时，我的Springboot应用程序也无法启动。根据我的项目要求，即使Elasticsearch服务器无法启动，我们的Springboot应用程序仍应运行，因为我们的大多数API都是基于Springboot和MongoDb构建的，只有少数依赖于Elasticsearch。有什么方法可以实现这一点吗？

弹性搜索配置

@Bean(destroyMethod = "close")
public RestHighLevelClient client() {

    RestHighLevelClient client = new RestHighLevelClient(
            RestClient.builder(new HttpHost(hostname, port,scheme))
                    .setRequestConfigCallback(
            new RestClientBuilder.RequestConfigCallback() {
                @Override
                public RequestConfig.Builder customizeRequestConfig(
                        RequestConfig.Builder requestConfigBuilder) {
                    return requestConfigBuilder
                            .setConnectTimeout(6000000)
                            .setSocketTimeout(6000000);
                }
            }));
    return client;
}

异常堆栈跟踪（为了安全起见隐藏了一些文本）

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-04-05 11:11:06.056 ERROR 9356 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '-----': Unsatisfied dependency expressed through field '-----'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '-----': Unsatisfied dependency expressed through field '-----'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '-----' defined in ----- defined in @EnableElasticsearchRepositories declared on ElasticsearchRepositoriesRegistrar.EnableElasticsearchRepositoriesConfiguration: Invocation of init method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository]: Constructor threw exception; nested exception is org.springframework.dao.DataAccessResourceFailureException: Connection refused; nested exception is java.lang.RuntimeException: Connection refused
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.9.jar:5.3.9]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.9.jar:5.3.9]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.4.jar:2.5.4]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.5.4.jar:2.5.4]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-2.5.4.jar:2.5.4]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) ~[spring-boot-2.5.4.jar:2.5.4]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-2.5.4.jar:2.5.4]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) ~[spring-boot-2.5.4.jar:2.5.4]
    at com.extramarks.questionMSA.MsaQuestionApplication.main(MsaQuestionApplication.java:24) ~[main/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.5.4.jar:2.5.4]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '-----': Unsatisfied dependency expressed through field '-----'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '-----' defined in ----- defined in @EnableElasticsearchRepositories declared on ElasticsearchRepositoriesRegistrar.EnableElasticsearchRepositoriesConfiguration: Invocation of init method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository]: Constructor threw exception; nested exception is org.springframework.dao.DataAccessResourceFailureException: Connection refused; nested exception is java.lang.RuntimeException: Connection refused
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.9.jar:5.3.9]
    ... 25 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name '-----' defined in ----- defined in @EnableElasticsearchRepositories declared on ElasticsearchRepositoriesRegistrar.EnableElasticsearchRepositoriesConfiguration: Invocation of init method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository]: Constructor threw exception; nested exception is org.springframework.dao.DataAccessResourceFailureException: Connection refused; nested exception is java.lang.RuntimeException: Connection refused
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1786) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.9.jar:5.3.9]
    ... 39 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository]: Constructor threw exception; nested exception is org.springframework.dao.DataAccessResourceFailureException: Connection refused; nested exception is java.lang.RuntimeException: Connection refused
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:221) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.lambda$getTargetRepositoryViaReflection$5(RepositoryFactorySupport.java:543) ~[spring-data-commons-2.5.4.jar:2.5.4]
    at java.base/java.util.Optional.map(Optional.java:265) ~[na:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getTargetRepositoryViaReflection(RepositoryFactorySupport.java:543) ~[spring-data-commons-2.5.4.jar:2.5.4]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getTargetRepositoryViaReflection(RepositoryFactorySupport.java:528) ~[spring-data-commons-2.5.4.jar:2.5.4]
    at org.springframework.data.elasticsearch.repository.support.ElasticsearchRepositoryFactory.getTargetRepository(ElasticsearchRepositoryFactory.java:74) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:319) ~[spring-data-commons-2.5.4.jar:2.5.4]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:323) ~[spring-data-commons-2.5.4.jar:2.5.4]
    at org.springframework.data.util.Lazy.getNullable(Lazy.java:230) ~[spring-data-commons-2.5.4.jar:2.5.4]
    at org.springframework.data.util.Lazy.get(Lazy.java:114) ~[spring-data-commons-2.5.4.jar:2.5.4]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:329) ~[spring-data-commons-2.5.4.jar:2.5.4]
    at org.springframework.data.elasticsearch.repository.support.ElasticsearchRepositoryFactoryBean.afterPropertiesSet(ElasticsearchRepositoryFactoryBean.java:69) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1845) ~[spring-beans-5.3.9.jar:5.3.9]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1782) ~[spring-beans-5.3.9.jar:5.3.9]
    ... 49 common frames omitted
Caused by: org.springframework.dao.DataAccessResourceFailureException: Connection refused; nested exception is java.lang.RuntimeException: Connection refused
    at org.springframework.data.elasticsearch.core.ElasticsearchExceptionTranslator.translateExceptionIfPossible(ElasticsearchExceptionTranslator.java:75) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.translateException(ElasticsearchRestTemplate.java:402) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.execute(ElasticsearchRestTemplate.java:385) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    at org.springframework.data.elasticsearch.core.DefaultIndexOperations.doExists(DefaultIndexOperations.java:107) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    at org.springframework.data.elasticsearch.core.AbstractDefaultIndexOperations.exists(AbstractDefaultIndexOperations.java:141) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    at org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository.(SimpleElasticsearchRepository.java:93) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[na:na]
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:208) ~[spring-beans-5.3.9.jar:5.3.9]
    ... 62 common frames omitted
Caused by: java.lang.RuntimeException: Connection refused
    at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.translateException(ElasticsearchRestTemplate.java:400) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    ... 71 common frames omitted
Caused by: java.net.ConnectException: Connection refused
    at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:880) ~[elasticsearch-rest-client-7.12.1.jar:7.12.1]
    at org.elasticsearch.client.RestClient.performRequest(RestClient.java:283) ~[elasticsearch-rest-client-7.12.1.jar:7.12.1]
    at org.elasticsearch.client.RestClient.performRequest(RestClient.java:270) ~[elasticsearch-rest-client-7.12.1.jar:7.12.1]
    at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1654) ~[elasticsearch-rest-high-level-client-7.12.1.jar:7.12.1]
    at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1639) ~[elasticsearch-rest-high-level-client-7.12.1.jar:7.12.1]
    at org.elasticsearch.client.IndicesClient.exists(IndicesClient.java:963) ~[elasticsearch-rest-high-level-client-7.12.1.jar:7.12.1]
    at org.springframework.data.elasticsearch.core.DefaultIndexOperations.lambda$doExists$2(DefaultIndexOperations.java:107) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.execute(ElasticsearchRestTemplate.java:383) ~[spring-data-elasticsearch-4.2.4.jar:4.2.4]
    ... 70 common frames omitted
Caused by: java.net.ConnectException: Connection refused
    at java.base/sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:na]
    at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:777) ~[na:na]
    at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvent(DefaultConnectingIOReactor.java:174) ~[httpcore-nio-4.4.14.jar:4.4.14]
    at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvents(DefaultConnectingIOReactor.java:148) ~[httpcore-nio-4.4.14.jar:4.4.14]
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:351) ~[httpcore-nio-4.4.14.jar:4.4.14]
    at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:221) ~[httpasyncclient-4.1.4.jar:4.1.4]
    at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:64) ~[httpasyncclient-4.1.4.jar:4.1.4]
    at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na] 

Answer 1

您可以用@Lazy标记它们，这样spring就不会在应用程序启动时构造它们。当您在运行时使用它们时，它将构造它们。

请看这个留档

https://memorynotfound.com/lazy-initialize-autowired-dependencies-with-lazy-annotation/