spingboot 2.1.3 与 elasticsearch7 兼容问题

pom 加入 elasticsearch7  的依赖，

        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>7.3.</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>7.3.</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-client</artifactId>
            <version>7.3.</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.3.</version>
        </dependency>

然后做过简单的测试， 发现了错误 ：

java.lang.NoSuchMethodError: org.elasticsearch.common.logging.Loggers.getLogger(Ljava/lang/String;)Lorg/apache/logging/log4j/Logger;

    at org.elasticsearch.transport.netty4.Netty4InternalESLogger.<init>(Netty4InternalESLogger.java:)
    at org.elasticsearch.transport.netty4.Netty4Utils$.newInstance(Netty4Utils.java:)
    at io.netty.util.internal.logging.InternalLoggerFactory.getInstance(InternalLoggerFactory.java:)
    at io.netty.util.internal.logging.InternalLoggerFactory.getInstance(InternalLoggerFactory.java:)
    at io.netty.util.internal.PlatformDependent.<clinit>(PlatformDependent.java:)
    at io.netty.util.ConstantPool.<init>(ConstantPool.java:)
    at io.netty.util.AttributeKey$.<init>(AttributeKey.java:)
    at io.netty.util.AttributeKey.<clinit>(AttributeKey.java:)
    at org.elasticsearch.transport.netty4.Netty4Transport.<clinit>(Netty4Transport.java:)
    at org.elasticsearch.transport.Netty4Plugin.getSettings(Netty4Plugin.java:)
    at org.elasticsearch.plugins.PluginsService.lambda$getPluginSettings$(PluginsService.java:)
    at java.util.stream.ReferencePipeline$$.accept(ReferencePipeline.java:)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:)
    at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:)
    at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:)
    at org.elasticsearch.plugins.PluginsService.getPluginSettings(PluginsService.java:)
    at org.elasticsearch.client.transport.TransportClient.buildTemplate(TransportClient.java:)
    at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:)
    at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:)
    at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:)
    at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:)
    at com.lkk.es.EsTest.testAaa(EsTest.java:)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
    at java.lang.reflect.Method.invoke(Method.java:)
    at org.junit.runners.model.FrameworkMethod$.runReflectiveCall(FrameworkMethod.java:)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:)
    at org.junit.runners.ParentRunner$.run(ParentRunner.java:)
    at org.junit.runners.ParentRunner$.schedule(ParentRunner.java:)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:)
    at org.junit.runners.ParentRunner.access$(ParentRunner.java:)
    at org.junit.runners.ParentRunner$.evaluate(ParentRunner.java:)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
    at java.lang.reflect.Method.invoke(Method.java:)
    at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:)

也真不知道 是咋回事！奇葩！

仔细检查 7.3.1 ，org.elasticsearch.common.logging.Loggers.getLogger  ,发现确实有那个 方法， 但是 实际上 引用的是 6.4.3 ！！

仔细检查错误日志，发现org.elasticsearch.transport.netty4.Netty4InternalESLogger 竟然是 6.4.3 的jar， 进一步往上跟，发现 org.elasticsearch.transport.Netty4Plugin 也是 ， 再往上走就是正常的 7.3.1了！

原因已经基本清楚了， 就是 jar 的依赖 的引入哪里出了问题。 我的 spingboot 是 2.1.3， 默认是没有 elasticsearch的吧

怎么解决呢？

首先，为什么会这样的问题？ pom问题？ 仔细检查了 pom 的依赖吗没有发现有 任何 transport-netty4-client-6.4.3 的引用啊！ 倒是发现了 transport-netty4-client-7.3.1 ！ 这样看来就奇怪了！ 难道是 隐藏的 依赖？

需要指定 elasticsearch.version 吗？ 试了， 好像也没有用。。

仔细检查pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>test_system</artifactId>
        <groupId>com.lkk</groupId>
        <version>2.2..GA</version>
    </parent>
    <modelVersion>4.0.</modelVersion>
    <artifactId>test_system_viewController</artifactId>
    <packaging>jar</packaging>
    <name>test_system_viewController</name>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-</project.build.sourceEncoding>
        <elasticsearch.version>7.3.</elasticsearch.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.lkk</groupId>
            <artifactId>test_system_domain</artifactId>
        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.</version>
        </dependency>

        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>7.3.</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>7.3.</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-client</artifactId>
            <version>7.3.</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.3.</version>
        </dependency>

<!--        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>-->
    </dependencies>
</project>

aa

加入：

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

试试。 发现..  没卵用。 难道是 上级  父 pom 引入的？

把

        <dependency>
            <groupId>com.lkk</groupId>
            <artifactId>test_system_domain</artifactId>
        </dependency>

放到了 dependencies 的最下面。 就好了！ （ 后面 再复原，竟然重现不了， ）

哦， 我 觉得应该是 缓存的原因吧！ 可能是 spring-boot-starter-data-elasticsearch 引入的 elasticsearch 是6.4.3， 然后一直 有缓存。。 需要通过某种手段把它清理才行！

参考：

https://stackoverflow.com/questions/57508456/how-to-correct-the-classpath-of-your-application-so-that-it-contains-a-single