环境

• idea 2022.1.3
• jdk17
• macos 10.14.6
• gradle 7.4.2(代码自动下载)

前置准备

• idea 设置JDK17
• idea 设置gradle JVM为Project JVM
• gradle 设置aliyun加速（可选）,有时设置了不如不设置更好

开始导入

• 导入项目
  使用 idea open项目下的build.gradle，等待编译结束
• 编译8.1版本的发行包
  这一步会下载所需的依赖jdk，如果报错可以多尝试几次，或者切换网络，执行该命令时，注意终端jdk环境

./gradlew localDistro

• 复制发行包到项目根目录同级目录新建home文件夹下，文件结构如下

├── elasticsearch
│   ├── BUILDING.md
│   ├── CONTRIBUTING.md
│   ├── LICENSE.txt
│   ├── NOTICE.txt
│   ├── README.asciidoc
│   ├── README.md
│   ├── TESTING.asciidoc
│   ├── Vagrantfile
│   ├── benchmarks
│   ├── build
│   ├── build-conventions
│   ├── build-tools
│   ├── build-tools-internal
│   ├── build.gradle
│   ├── ccr
│   ├── checkstyle_ide.xml
│   ├── client
│   ├── dev-tools
│   ├── distribution
│   ├── docs
│   ├── gradle
│   ├── gradle.properties
│   ├── gradlew
│   ├── gradlew.bat
│   ├── libs
│   ├── licenses
│   ├── modules
│   ├── plugins
│   ├── qa
│   ├── rest-api-spec
│   ├── server
│   ├── settings.gradle
│   ├── test
│   └── x-pack
├── home
│   ├── LICENSE.txt
│   ├── NOTICE.txt
│   ├── README.asciidoc
│   ├── bin
│   ├── config
│   ├── data
│   ├── jdk.app
│   ├── lib
│   ├── logs
│   ├── modules
└── └── plugins

• 启动
  找到Elasticsearch.java 运行main方法
• 报错1：ERROR: the system property [es.path.conf] must be set

-Des.path.conf=/cxt/codework/github/elasticsearch/8.1/home/config

• 报错2：path.home is not configured

-Des.path.home=/cxt/codework/github/elasticsearch/8.1/home

• 报错3：main ERROR Could not register mbeans java.security.AccessControlException: access denied ("javax.management.MBeanTrustPermission" "register")
• 创建一个java.policy,内容如下(完整内容在末尾获取)

grant {
    permission javax.management.MBeanTrustPermission "register";
};

运行时指定

-Djava.security.policy=/cxt/codework/github/elasticsearch/8.1/home/config/java.policy

• 报错4：access denied ("java.lang.RuntimePermission" "createClassLoader")
  刚才的java.policy文件中增加如下(完整内容在末尾获取)

    permission java.lang.RuntimePermission "createClassLoader";

• 报错5：java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "setContextClassLoader")
  刚才的java.policy文件中增加如下(完整内容在末尾获取)

    permission java.lang.RuntimePermission "setContextClassLoader";

• 报错6：access denied ("org.elasticsearch.secure_sm.ThreadPermission" "modifyArbitraryThreadGroup")
  刚才的java.policy文件中增加如下(完整内容在末尾获取)

    permission org.elasticsearch.secure_sm.ThreadPermission "modifyArbitraryThreadGroup";

• 报错7：报错如下(完整内容在末尾获取)

Caused by: java.lang.IllegalArgumentException: Unknown codebases [codebase.elasticsearch-plugin-classloader, codebase.elasticsearch, codebase.elasticsearch-secure-sm] in policy file [file:/cxt/codework/github/elasticsearch/8.1/elasticsearch/server/out/production/resources/org/elasticsearch/bootstrap/security.policy]

解决如下，找到 server/src/main/resources/org/elasticsearch/bootstrap/security.policy，注释掉一下三个
[codebase.elasticsearch-plugin-classloader, codebase.elasticsearch, codebase.elasticsearch-secure-sm]

//grant codeBase "${codebase.elasticsearch-plugin-classloader}" {
  // needed to create the classloader which allows plugins to extend other plugins
  //permission java.lang.RuntimePermission "createClassLoader";
//};

//grant codeBase "${codebase.elasticsearch-secure-sm}" {
//  permission java.security.AllPermission;
//};

//// Elasticsearch core:
//// These are only allowed inside the server jar, not in plugins
//grant codeBase "${codebase.elasticsearch}" {
  // needed for loading plugins which may expect the context class loader to be set
//  permission java.lang.RuntimePermission "setContextClassLoader";
//};

总结

• 完整的启动参数设置如下

-Des.path.conf=/cxt/codework/github/elasticsearch/8.1/home/config
-Des.path.home=/cxt/codework/github/elasticsearch/8.1/home
-Djava.security.policy=/cxt/codework/github/elasticsearch/8.1/home/config/java.policy
-Dlog4j2.disable.jmx=true

也可以在Elasticsearch.main方法执行前通过代码的形式指定环境变量(可选)

System.setProperty("es.path.conf","/cxt/codework/github/elasticsearch/8.1/home/config");
System.setProperty("es.path.home", "/cxt/codework/github/elasticsearch/8.1/home");
System.setProperty("log4j2.disable.jmx", "true");    System.setProperty("java.security.policy","/cxt/codework/github/elasticsearch/8.1/home/config/java.policy");

• 完整的java.policy文件如下

grant {
    permission javax.management.MBeanTrustPermission "register";
    permission java.lang.RuntimePermission "createClassLoader";
    permission java.lang.RuntimePermission "setContextClassLoader";
    permission org.elasticsearch.secure_sm.ThreadPermission "modifyArbitraryThreadGroup";
};

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