由以下原因引起：java.lang.ClassNotFoundException：org.elasticsearch.transport.Netty3Plugin

Question

我正在使用 Spring Boot 2.0.3 版本，但在实例化 org.elasticsearch.client.Client 时遇到问题。我的代码：

Client client = new PreBuiltTransportClient(Settings.builder()
                .put("cluster.name", clustername)
                .build())
                .addTransportAddress(
new InetSocketTransportAddress(InetAddress.getByName(host), port)
);

这段代码给我的错误是：

Caused by: java.lang.NoClassDefFoundError: org/elasticsearch/transport/Netty3Plugin
at org.elasticsearch.transport.client.PreBuiltTransportClient.<clinit>(PreBuiltTransportClient.java:91) ~[transport-5.6.10.jar:5.6.10]
at kz.icode.idmatrix.config.ElasticsearchConfiguration.client(ElasticsearchConfiguration.java:56) ~[classes/:na]
at kz.icode.idmatrix.config.ElasticsearchConfiguration$$EnhancerBySpringCGLIB$e53ae93.CGLIB$client[=13=](<generated>) ~[classes/:na]
at kz.icode.idmatrix.config.ElasticsearchConfiguration$$EnhancerBySpringCGLIB$e53ae93$$FastClassBySpringCGLIB$$fef36179.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at kz.icode.idmatrix.config.ElasticsearchConfiguration$$EnhancerBySpringCGLIB$e53ae93.client(<generated>) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_171]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_171]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_171]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_171]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
... 99 common frames omitted

我使用 org.elasticsearch:elasticsearch:5.6.10 和 org.elasticsearch.client:client:5.6.10。

Answer 1

仅添加 spring-boot-starter-data-elasticsearch.

并非所有依赖项都满足

有必要显式定义所有剩余的依赖项：

    <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>transport</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>

    <dependency>
        <groupId>org.elasticsearch.plugin</groupId>
        <artifactId>transport-netty4-client</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>

如果您声明了 parent，很可能 <version> 标签可以省略。

Answer 2

<dependency> 
    <groupId>org.elasticsearch.client</groupId> 
    <artifactId>transport</artifactId> 
</dependency>

我已经解决了。

由以下原因引起：java.lang.ClassNotFoundException：org.elasticsearch.transport.Netty3Plugin

Caused by: java.lang.ClassNotFoundException: org.elasticsearch.transport.Netty3Plugin

java

spring

elasticsearch

spring-boot

spring-data-elasticsearch