java - NoClassDefFoundError 创建 RestHighLevelClient bean 时出错

Question

我在 SpringBoot 应用程序中创建 HighEndRestClient bean 时遇到错误。我已经完成了一个测试“应用程序”，我检查了我可以实例化我想要的对象，然后进行我想要的调用，现在我正在逐步制作一个新的应用程序。

我在pom中有这些依赖

    <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-client</artifactId>
        <version>5.6.3</version>
    </dependency>

    <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-high-level-client</artifactId>
        <version>5.6.3</version>
    </dependency>

我已经在配置类中编写了这段非常基本的代码，但还没有做太多事情

@Configuration
@PropertySource(value = "classpath:application.properties")
@EnableElasticsearchRepositories(basePackages = "com.indexbuilder.es.repo")
public class ElasticsearchConfiguration {
    @Value("${elasticsearch.host}")
    private String EsHost;

    @Value("${elasticsearch.port}")
    private int EsPort;

    @Value("${elasticsearch.clustername}")
    private String EsClusterName;


    @Bean
    public RestClientBuilder coreBuilder() throws Exception {
        RestClientBuilder builder = RestClient.builder(new HttpHost("localhost", 9200, "http"));
        builder.setMaxRetryTimeoutMillis(10000);

        builder.setFailureListener(new RestClient.FailureListener() {
            @Override
            public void onFailure(HttpHost host) {
                System.out.println("FAILURE !!!! FailureListener HAS WOKEN UP!!!! CREATYE A FAILURE LISTENER BEAN" );
            }
        });

        return builder;
      }

    @Bean
    public RestClient restLowLevelClient() throws Exception{
        RestClient restClient = coreBuilder().build();
        return restClient;
    }

据我所知，这工作得很好(我还没有做太多...)

当我添加它时(最初我传入 RestClient bean，但现在为了更清晰起见，我临时创建了一个本地对象)

    @Bean
    public RestHighLevelClient restHighLevelClient() throws Exception{
        RestClient restClient = coreBuilder().build();
        RestHighLevelClient client = new RestHighLevelClient(restClient);
        return client;
    }

我得到这个 java.lang.NoClassDefFoundError 错误

=========|_|==============|___/=///_/ :: Spring Boot :: (v1.5.1.RELEASE)

[WARNING] java.lang.reflect.InvocationTargetException 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.maven.AbstractRunMojo$LaunchRunner.run(AbstractRunMojo.java:527) at java.lang.Thread.run(Thread.java:745) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'restHighLevelClient' defined in class path resource [com/indexbuilder/configuration/ElasticsearchConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.elasticsearch.client.RestHighLevelClient]: Factory method 'restHighLevelClient' threw exception; nested exception is java.lang.NoClassDefFoundError: org/elasticsearch/action/main/MainRequest at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:598) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1140) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1034) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:525) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:744) 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:737) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) at com.indexbuilder.SpringBootStartUpConfig.main(SpringBootStartUpConfig.java:84) ... 6 more Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.elasticsearch.client.RestHighLevelClient]: Factory method 'restHighLevelClient' threw exception; nested exception is java.lang.NoClassDefFoundError: org/elasticsearch/action/main/MainRequest at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:587) ... 24 more Caused by: java.lang.NoClassDefFoundError: org/elasticsearch/action/main/MainRequest at com.indexbuilder.configuration.ElasticsearchConfiguration.restHighLevelClient(ElasticsearchConfiguration.java:95) at com.indexbuilder.configuration.ElasticsearchConfiguration$$EnhancerBySpringCGLIB$$62f74d9a.CGLIB$restHighLevelClient$1() at com.indexbuilder.configuration.ElasticsearchConfiguration$$EnhancerBySpringCGLIB$$62f74d9a$$FastClassBySpringCGLIB$$2b29ad7b.invoke() at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) at com.indexbuilder.configuration.ElasticsearchConfiguration$$EnhancerBySpringCGLIB$$62f74d9a.restHighLevelClient() 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.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ... 25 more Caused by: java.lang.ClassNotFoundException: org.elasticsearch.action.main.MainRequest at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 36 more

谁能指出我正确的方向？

Answer 1

您可能还需要核心依赖项:

<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>5.6.3</version>
</dependency>

NoClassDefFoundError 通常是配置错误 - 这意味着您使用的代码引用了某个类，但该类本身不在类路径中。在这种情况下，这也可能是相关 Elasticsearch pos 本身的依赖管理错​​误，因为它们应该包含所需的类 - 但除了可能提出问题之外，您对此无能为力。