spingboot 2.1.3 与 elasticsearch7 兼容问题
pom 加入 elasticsearch7 的依赖，
org.elasticsearch elasticsearch 7.3.1 org.elasticsearch.client transport 7.3.1 org.elasticsearch.client elasticsearch-rest-client 7.3.1 org.elasticsearch.client elasticsearch-rest-high-level-client 7.3.1
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.(Netty4InternalESLogger.java:34) at org.elasticsearch.transport.netty4.Netty4Utils$1.newInstance(Netty4Utils.java:53) at io.netty.util.internal.logging.InternalLoggerFactory.getInstance(InternalLoggerFactory.java:93) at io.netty.util.internal.logging.InternalLoggerFactory.getInstance(InternalLoggerFactory.java:86) at io.netty.util.internal.PlatformDependent. (PlatformDependent.java:70) at io.netty.util.ConstantPool. (ConstantPool.java:32) at io.netty.util.AttributeKey$1. (AttributeKey.java:27) at io.netty.util.AttributeKey. (AttributeKey.java:27) at org.elasticsearch.transport.netty4.Netty4Transport. (Netty4Transport.java:231) at org.elasticsearch.transport.Netty4Plugin.getSettings(Netty4Plugin.java:56) at org.elasticsearch.plugins.PluginsService.lambda$getPluginSettings$0(PluginsService.java:89) at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:267) at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) at org.elasticsearch.plugins.PluginsService.getPluginSettings(PluginsService.java:89) at org.elasticsearch.client.transport.TransportClient.buildTemplate(TransportClient.java:156) at org.elasticsearch.client.transport.TransportClient. (TransportClient.java:296) at org.elasticsearch.transport.client.PreBuiltTransportClient. (PreBuiltTransportClient.java:130) at org.elasticsearch.transport.client.PreBuiltTransportClient. (PreBuiltTransportClient.java:116) at org.elasticsearch.transport.client.PreBuiltTransportClient. (PreBuiltTransportClient.java:106) at com.lkk.es.EsTest.testAaa(EsTest.java:30) 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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) 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 com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:66)
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
"1.0" encoding="UTF-8"?>"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"> test_system com.lkk 2.2.0.GA 4.0.0 test_system_viewController jar test_system_viewController http://maven.apache.org UTF-8 7.3.1 com.lkk test_system_domain com.google.code.gson gson 2.8.5 org.elasticsearch elasticsearch 7.3.1 org.elasticsearch.client transport 7.3.1 org.elasticsearch.client elasticsearch-rest-client 7.3.1 org.elasticsearch.client elasticsearch-rest-high-level-client 7.3.1
aa
加入：
org.springframework.boot spring-boot-starter-data-elasticsearch
试试。 发现.. 没卵用。 难道是 上级 父 pom 引入的？
把
com.lkk test_system_domain
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
posted on
2019-09-19 15:03 CanntBelieve 阅读(
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