elasticsearch6.2.4源碼Gradle構建idea環境(2)

Idea 導入ES源碼工程

準備工作
1）導入源碼前重新啓動電腦，保證gradle、jdk9和IntelliJ IDEA 2017.2.3環境是好的

源碼根目錄
E:\workspace\idea\elasticsearch-6.2.4

導入步驟
根據CONTRIBUTING.md說明:

then `File->New Project From Existing Sources`. 
Point to the root ofthe source directory, 
select`Import project from external model->Gradle`,
enable`Use auto-import`

ES Mian class
org.elasticsearch.bootstrap.Elasticsearch

/**
     * Main entry point for starting elasticsearch
     */
    public static void main(final String[] args) throws Exception {
        // we want the JVM to think there is a security manager installed so that if internal policy decisions that would be based on the
        // presence of a security manager or lack thereof act as if there is a security manager present (e.g., DNS cache policy)
        System.setSecurityManager(new SecurityManager() {
            @Override
            public void checkPermission(Permission perm) {
                // grant all permissions so that we can later set the security manager to the one that we want
            }
        });
        LogConfigurator.registerErrorListener();
        final Elasticsearch elasticsearch = new Elasticsearch();
        int status = main(args, elasticsearch, Terminal.DEFAULT);
        if (status != ExitCodes.OK) {
            exit(status);
        }
    }

啓動main

第一次報錯

ERROR: the system property [es.path.conf] must be set
Exception in thread "main" java.lang.IllegalStateException: path.home is not configured

解決方法:

根目錄新建home和home\config 目錄
E:\workspace\idea\elasticsearch-6.2.4\home
E:\workspace\idea\elasticsearch-6.2.4\home\config
下載同版本號的 Elasticsearch6.2.4發行版可以運行的，將其中 config 目錄和modules拷貝到 home 目錄中，項目啓動要用到，保證config裏面的配置是對的

配置jvm參數
-Didea.no.launcher=true
-Des.path.conf=E:\workspace\idea\demo\elasticsearch-6.2.4\home\config
-Des.path.home=E:\workspace\idea\demo\elasticsearch-6.2.4\home

繼續運行報錯

main ERROR Could not register mbeans java.security.AccessControlException: access denied ("javax.management.MBeanTrustPermission" "register")

解決方法

配置jvm參數
-Dlog4j2.disable.jmx=true

繼續運行報錯

org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: plugins directory
[E:\workspace\idea\elasticsearch-6.2.4\home\plugins] not found

解決方法

新建目錄：E:\workspace\idea\elasticsearch-6.2.4\home\plugins

繼續運行報錯

[2019-12-05T21:03:31,634][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-1] fatal error in thread [main], exiting
java.lang.NoClassDefFoundError: org/elasticsearch/plugins/ExtendedPluginsClassLoader

分析源碼：

發現 ExtendedPluginsClassLoader 的模塊是Provided，導致編譯時找不到此類

解決方法

將 Provided 改成 Compile ， 但更改會提示 distribution\bwc 有多個版本5.6 和 6.0

解決多版本衝突方法如下：

將多餘版本忽略掉，只保留1個版本 6.x

運行繼續報錯

rg.elasticsearch.bootstrap.StartupException: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "createClassLoader")

解決方法

新建文件：java.policy
放到目錄：E:\workspace\idea\demo\elasticsearch-6.2.4\home\config
內容：
grant {
    permission java.lang.RuntimePermission "createClassLoader";
};
配置jvm參數
-Djava.security.policy==E:\workspace\idea\demo\elasticsearch-6.2.4\home\config\java.policy

最終目錄
紅色框子目錄是新建的目錄，其他目錄源碼自己動態生成的

最終JVM參數

-Didea.no.launcher=true
-Dlog4j2.disable.jmx=true
-Des.path.conf=E:\workspace\idea\demo\elasticsearch-6.2.4\home\config
-Des.path.home=E:\workspace\idea\demo\elasticsearch-6.2.4\home
-Djava.security.policy==E:\workspace\idea\demo\elasticsearch-6.2.4\home\config\java.policy

啓動成功