第一章 Elasticsearch6.8源码阅读环境搭建

目录

• 一、环境说明
• 二、基础环境搭建
  • 2.1 安装jdk
  • 2.2 安装gradle
• 三、源码阅读环境搭建步骤
  • 3.1 源码下载
  • 3.2 导入IDEA
  • 3.3 编译打包
• 四、调试Elasticsearch
  • 4.1本地运行

一、环境说明

二、基础环境搭建

2.1 安装jdk

下载jdk-12，jdk-12下载地址

解压openjdk-12+32_windows-x64_bin.zip 到D:Program FilesJava

配置环境变量

2.2 安装gradle

gradle下载地址

解压gradle-5.4.1-all.zip到D盘

配置环境变量

三、源码阅读环境搭建步骤

3.1 源码下载

3.1.1 手动下载

进入GitHub官网，选择6.8分之，下载源码

elasticsearch源码下载地址

3.1.2 idea git插件下载 

File → New → Project fromVersion Control

切换分之为6.8

3.2 导入IDEA

导入代码到IDEA，之后进行jdk和gradle设置

设置jdk

设置gradle

 3.3 编译打包

idea的Terminal控制台执行命令

gradlew assemble

 ​​​​

打包的文件在distribution/archives模块中

Reload project

复制elasticsearch-6.8.23-SNAPSHOT.zip到E:optes文件夹下，并解压改名为elasticsearch-6.8

 四、调试Elasticsearch

4.1 本地运行

运行server模块的 org.elasticsearch.bootstrap.Elasticsearch 类

报错如下

点击Run → Edit Configurations

增加VM Opinton配置

-Des.path.home=E:opteselasticsearch-6.8
-Des.path.conf=E:opteselasticsearch-6.8config
-Xms1g
-Xmx1g
-Dlog4j2.disable.jmx=true
-Djava.security.policy=E:opteselasticsearch-6.8configelasticsearch.policy

在E:opteselasticsearch-6.8config文件夹中增加elasticsearch.policy文件，内容为

grant {
    permission javax.management.MBeanTruxtPermission "register";
    permission javax.management.MBeanServerPermission "createMBeanServer";
    permission java.lang.RuntimePermission "createClassLoader";
}; 

 启动Elasticsearch

[2022-01-02T21:42:43,108][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [hfeiN1g] fatal error in thread [main], exiting
java.lang.NoClassDefFoundError: org/elasticsearch/plugins/ExtendedPluginsClassLoader
    at org.elasticsearch.plugins.PluginsService.loadBundle(PluginsService.java:547) ~[classes/:?]
    at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:473) ~[classes/:?]
    at org.elasticsearch.plugins.PluginsService.(PluginsService.java:163) ~[classes/:?]
    at org.elasticsearch.node.Node.(Node.java:339) ~[classes/:?]
    at org.elasticsearch.node.Node.(Node.java:266) ~[classes/:?]
    at org.elasticsearch.bootstrap.Bootstrap$5.(Bootstrap.java:212) ~[classes/:?]
    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:212) ~[classes/:?]
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:333) ~[classes/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[classes/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[classes/:?]
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[classes/:?]
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[classes/:?]
    at org.elasticsearch.cli.Command.main(Command.java:90) ~[classes/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:116) ~[classes/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[classes/:?]
Caused by: java.lang.ClassNotFoundException: org.elasticsearch.plugins.ExtendedPluginsClassLoader
    at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583) ~[?:?]
    at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[?:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[?:?]
    ... 15 more
 

上述错误是由于IDEA配置不对造成

修改结果参考下图

a) gradle配置修改

 Edit Configuration

 运行

org.elasticsearch.bootstrap.Elasticsearch

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