渣渣的 ElasticSearch 源碼解析 —— 環(huán)境搭建

wudengzan 發(fā)布于2019-08-19 11:03 / 1488人閱讀

摘要：注意這個版本需要和下面的源碼版本一致下載源碼從上下載相應(yīng)版本的源代碼，這里建議用，這樣的話后面你可以隨意切換到的其他版本去。我們看下有哪些版本的找到了目前源碼版本最新的版本的穩(wěn)定版為切換到該版本于是就可以切換到該穩(wěn)定版本了。

關(guān)注我

轉(zhuǎn)載請務(wù)必注明原創(chuàng)地址為：http://www.54tianzhisheng.cn/2018/08/05/es-code01/

軟件環(huán)境

1、Intellij Idea:2018.2版本

2、Elasticsearch 源碼版本: 6.3.2

3、JDK:10.0.2

4、Gradle : 建議 4.5 及以上版本

5、Macbook Pro 2017

安裝 ElasticSearch

去 https://www.elastic.co/downlo... 這里找到 ElasticSearch 6.3.2 版本，下載后然后解壓就好了。（注意：這個版本需要和下面的源碼版本一致）

下載源碼

從 https://github.com/elastic/el... 上下載相應(yīng)版本的源代碼，這里建議用 git clone ，這樣的話后面你可以隨意切換到 ElasticSearch 的其他版本去。

git clone [email protected]:elastic/elasticsearch.git

我們看下有哪些版本的：

git tag

找到了目前源碼版本最新的版本的穩(wěn)定版為：v6.3.2

切換到該版本：

git checkout v6.3.2

于是就可以切換到該穩(wěn)定版本了。接下來不要直接導(dǎo)入到 IDEA/Eclipse 中。

編譯

GitHub 這里已經(jīng)有描述如何導(dǎo)入 IDEA/Eclipse 中：

JDK 10 is required to build Elasticsearch. You must have a JDK 10 installation with the environment variable JAVA_HOME referencing the path to Java home for your JDK 10 installation. By default, tests use the same runtime as JAVA_HOME. However, since Elasticsearch, supports JDK 8 the build supports compiling with JDK 10 and testing on a JDK 8 runtime; to do this, set RUNTIME_JAVA_HOME pointing to the Java home of a JDK 8 installation. Note that this mechanism can be used to test against other JDKs as well, this is not only limited to JDK 8.

Note: It is also required to have JAVA7_HOME, JAVA8_HOME and JAVA10_HOME available so that the tests can pass.

Warning: do not use sdkman for Java installations which do not have proper jrunscript for jdk distributions.

Elasticsearch uses the Gradle wrapper for its build. You can execute Gradle using the wrapper via the gradlew script in the root of the repository.

Configuring IDEs And Running Tests
Eclipse users can automatically configure their IDE: ./gradlew eclipse then File: Import: Existing Projects into Workspace. Select the option Search for nested projects. Additionally you will want to ensure that Eclipse is using 2048m of heap by modifying eclipse.ini accordingly to avoid GC overhead errors.

IntelliJ users can automatically configure their IDE: ./gradlew idea then File->New Project From Existing Sources. Point to the root of the source directory, select Import project from external model->Gradle, enable Use auto-import. In order to run tests directly from IDEA 2017.2 and above, it is required to disable the IDEA run launcher in order to avoid idea_rt.jar causing "jar hell". This can be achieved by adding the -Didea.no.launcher=true JVM option. Alternatively, idea.no.launcher=true can be set in the idea.properties file which can be accessed under Help > Edit Custom Properties (this will require a restart of IDEA). For IDEA 2017.3 and above, in addition to the JVM option, you will need to go to Run->Edit Configurations->...->Defaults->JUnit and verify that the Shorten command line setting is set to user-local default: none. You may also need to remove ant-javafx.jar from your classpath if that is reported as a source of jar hell.

To run an instance of elasticsearch from the source code run ./gradlew run

The Elasticsearch codebase makes heavy use of Java asserts and the test runner requires that assertions be enabled within the JVM. This can be accomplished by passing the flag -ea to the JVM on startup.

For IntelliJ, go to Run->Edit Configurations...->Defaults->JUnit->VM options and input -ea.

For Eclipse, go to Preferences->Java->Installed JREs and add -ea to VM Arguments.

上面說了下如何編譯 Elasticsearch 和如何在 ide 中配置好環(huán)境。下面說下步驟吧：（這里我只是演示在 IDEA 中如何導(dǎo)入）

1、在我們下載的 Elasticsearch 根目錄下執(zhí)行命令：(執(zhí)行已經(jīng)寫好的腳本 gradlew)

./gradlew idea

請注意版本和我的一致，早的版本可能沒有該執(zhí)行腳本，需要執(zhí)行 gradle idea 命令

最后結(jié)果如下：

2、導(dǎo)入 IDEA

idea 中 File -> New Project From Existing Sources 選擇你下載的 Elasticsearch 根目錄，然后點 open ，之后 Import project from external model -> Gradle , 選中 Use auto-import, 然后就可以了。

導(dǎo)入進(jìn)去后，gradle 又會編譯一遍，需要等一會，好了之后如下：

運行

打開 server 模塊下的 Elasticsearch 類：org.elasticsearch.bootstrap.Elasticsearch，運行里面的 main 函數(shù)。

1、報錯如下：

ERROR: the system property [es.path.conf] must be set

我們在運行的配置 vm options 如下：（后面啟動流程會寫為什么會報這個錯誤）

-Des.path.conf="/usr/local/elasticsearch-6.3.2/config"

2、再次運行，報錯如下：

Exception in thread "main" java.lang.IllegalStateException: path.home is not configured
    at org.elasticsearch.env.Environment.(Environment.java:103)
    at org.elasticsearch.env.Environment.(Environment.java:94)
    at org.elasticsearch.node.InternalSettingsPreparer.prepareEnvironment(InternalSettingsPreparer.java:86)
    at org.elasticsearch.cli.EnvironmentAwareCommand.createEnv(EnvironmentAwareCommand.java:95)
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124)
    at org.elasticsearch.cli.Command.main(Command.java:90)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86)

我們在運行的配置 vm options 如下：（后面啟動流程會寫為什么會報這個錯誤）

-Des.path.home="/usr/local/elasticsearch-6.3.2"

3、再次運行，報錯如下：

2018-08-01 09:38:03,974 main ERROR Could not register mbeans java.security.AccessControlException: access denied ("javax.management.MBeanTrustPermission" "register")
    at java.base/java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
    at java.base/java.lang.SecurityManager.checkPermission(SecurityManager.java:371)
    at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.checkMBeanTrustPermission(DefaultMBeanServerInterceptor.java:1805)
    at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:318)
    at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
    at org.apache.logging.log4j.core.jmx.Server.register(Server.java:389)
    at org.apache.logging.log4j.core.jmx.Server.reregisterMBeansAfterReconfigure(Server.java:167)
    at org.apache.logging.log4j.core.jmx.Server.reregisterMBeansAfterReconfigure(Server.java:140)
    at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:556)
    at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:261)
    at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:206)
    at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:220)
    at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:197)
    at org.elasticsearch.common.logging.LogConfigurator.configureStatusLogger(LogConfigurator.java:171)
    at org.elasticsearch.common.logging.LogConfigurator.configure(LogConfigurator.java:140)
    at org.elasticsearch.common.logging.LogConfigurator.configure(LogConfigurator.java:119)
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:294)
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:136)
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:127)
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124)
    at org.elasticsearch.cli.Command.main(Command.java:90)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86)

我們在運行的配置 vm options 如下：

-Dlog4j2.disable.jmx=true

4、如果你用的是 JDK 1.8 編譯的應(yīng)該還會報這個錯誤

[2018-08-01T11:02:24,663][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: jar hell!
class: jdk.packager.services.UserJvmOptionsService
jar1: /Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home/lib/ant-javafx.jar
jar2: /Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home/lib/packager.jar
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:140) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:127) ~[main/:?]
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[main/:?]
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[main/:?]
    at org.elasticsearch.cli.Command.main(Command.java:90) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86) ~[main/:?]
Caused by: java.lang.IllegalStateException: jar hell!
class: jdk.packager.services.UserJvmOptionsService
jar1: /Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home/lib/ant-javafx.jar
jar2: /Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home/lib/packager.jar
    at org.elasticsearch.bootstrap.JarHell.checkClass(JarHell.java:273) ~[main/:?]
    at org.elasticsearch.bootstrap.JarHell.checkJarHell(JarHell.java:190) ~[main/:?]
    at org.elasticsearch.bootstrap.JarHell.checkJarHell(JarHell.java:86) ~[main/:?]
    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:198) ~[main/:?]
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:326) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:136) ~[main/:?]
    ... 6 more
2018-08-01 11:02:24,713 Thread-2 ERROR No log4j2 configuration file found. Using default configuration: logging only errors to the console. Set system property "log4j2.debug" to show Log4j2 internal initialization logging.

有兩個解決方法就是，

（1）、把源碼中有關(guān)使用了 JarHell.checkJarHell 代碼的地方全部注釋掉就好了

（2）、換成 JDK 10 編譯

兩種方法我都試了是可行的，建議直接換第二種方案吧！

5、然后再啟動的話，應(yīng)該沒問題了,出現(xiàn)下面日志：（網(wǎng)上很多人在這步就好了）

[elasticsearch] Java HotSpot(TM) 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
[elasticsearch] [2018-08-04T16:42:26,073][INFO ][o.e.n.Node               ] [node-0] initializing ...
[elasticsearch] [2018-08-04T16:42:26,185][INFO ][o.e.e.NodeEnvironment    ] [node-0] using [1] data paths, mounts [[/ (/dev/disk1s1)]], net usable_space [109.3gb], net total_space [233.4gb], types [apfs]
[elasticsearch] [2018-08-04T16:42:26,187][INFO ][o.e.e.NodeEnvironment    ] [node-0] heap size [494.9mb], compressed ordinary object pointers [true]
[elasticsearch] [2018-08-04T16:42:26,190][INFO ][o.e.n.Node               ] [node-0] node name [node-0], node ID [o9SuMXP-R7uvJLtE3h37Rw]
[elasticsearch] [2018-08-04T16:42:26,191][INFO ][o.e.n.Node               ] [node-0] version[6.3.2-SNAPSHOT], pid[61499], build[default/zip/053779d/2018-08-04T08:39:59.714654Z], OS[Mac OS X/10.13.5/x86_64], JVM["Oracle Corporation"/Java HotSpot(TM) 64-Bit Server VM/10.0.2/10.0.2+13]
[elasticsearch] [2018-08-04T16:42:26,191][INFO ][o.e.n.Node               ] [node-0] JVM arguments [-Xms1g, -Xmx1g, -XX:+UseConcMarkSweepGC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Djava.io.tmpdir=/var/folders/mb/3vpbvkkx13l2jmpt2kmmt0fr0000gn/T/elasticsearch.URRKTybG, -XX:+HeapDumpOnOutOfMemoryError, -XX:HeapDumpPath=data, -XX:ErrorFile=logs/hs_err_pid%p.log, -Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m, -Djava.locale.providers=COMPAT, -XX:UseAVX=2, -ea, -esa, -Xms512m, -Xmx512m, -Des.path.home=/Users/zhisheng/IdeaProjects/github/elasticsearch/distribution/build/cluster/run node0/elasticsearch-6.3.2-SNAPSHOT, -Des.path.conf=/Users/zhisheng/IdeaProjects/github/elasticsearch/distribution/build/cluster/run node0/elasticsearch-6.3.2-SNAPSHOT/config, -Des.distribution.flavor=default, -Des.distribution.type=zip]
[elasticsearch] [2018-08-04T16:42:26,191][WARN ][o.e.n.Node               ] [node-0] version [6.3.2-SNAPSHOT] is a pre-release version of Elasticsearch and is not suitable for production
[elasticsearch] [2018-08-04T16:42:28,808][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [aggs-matrix-stats]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [analysis-common]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [ingest-common]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [lang-expression]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [lang-mustache]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [lang-painless]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [mapper-extras]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [parent-join]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [percolator]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [rank-eval]
[elasticsearch] [2018-08-04T16:42:28,809][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [reindex]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [repository-url]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [transport-netty4]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [tribe]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-core]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-deprecation]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-graph]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-logstash]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-ml]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-monitoring]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-rollup]
[elasticsearch] [2018-08-04T16:42:28,810][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-security]
[elasticsearch] [2018-08-04T16:42:28,811][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-sql]
[elasticsearch] [2018-08-04T16:42:28,811][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-upgrade]
[elasticsearch] [2018-08-04T16:42:28,811][INFO ][o.e.p.PluginsService     ] [node-0] loaded module [x-pack-watcher]
[elasticsearch] [2018-08-04T16:42:28,811][INFO ][o.e.p.PluginsService     ] [node-0] no plugins loaded
[elasticsearch] [2018-08-04T16:42:32,722][INFO ][o.e.x.s.a.s.FileRolesStore] [node-0] parsed [0] roles from file [/Users/zhisheng/IdeaProjects/github/elasticsearch/distribution/build/cluster/run node0/elasticsearch-6.3.2-SNAPSHOT/config/roles.yml]
[elasticsearch] [2018-08-04T16:42:33,358][INFO ][o.e.x.m.j.p.l.CppLogMessageHandler] [controller/61517] [Main.cc@109] controller (64 bit): Version 6.3.2-SNAPSHOT (Build 903094f295d249) Copyright (c) 2018 Elasticsearch BV
[elasticsearch] [2018-08-04T16:42:33,783][DEBUG][o.e.a.ActionModule       ] Using REST wrapper from plugin org.elasticsearch.xpack.security.Security
[elasticsearch] [2018-08-04T16:42:34,110][INFO ][o.e.d.DiscoveryModule    ] [node-0] using discovery type [zen]
[elasticsearch] [2018-08-04T16:42:34,971][INFO ][o.e.n.Node               ] [node-0] initialized
[elasticsearch] [2018-08-04T16:42:34,971][INFO ][o.e.n.Node               ] [node-0] starting ...
[elasticsearch] [2018-08-04T16:42:35,217][INFO ][o.e.t.TransportService   ] [node-0] publish_address {127.0.0.1:9300}, bound_addresses {[::1]:9300}, {127.0.0.1:9300}
[elasticsearch] [2018-08-04T16:42:38,291][INFO ][o.e.c.s.MasterService    ] [node-0] zen-disco-elected-as-master ([0] nodes joined)[, ], reason: new_master {node-0}{o9SuMXP-R7uvJLtE3h37Rw}{xjoT1zvpRsm1ZDGLCab1sA}{127.0.0.1}{127.0.0.1:9300}{ml.machine_memory=17179869184, xpack.installed=true, testattr=test, ml.max_open_jobs=20, ml.enabled=true}
[elasticsearch] [2018-08-04T16:42:38,295][INFO ][o.e.c.s.ClusterApplierService] [node-0] new_master {node-0}{o9SuMXP-R7uvJLtE3h37Rw}{xjoT1zvpRsm1ZDGLCab1sA}{127.0.0.1}{127.0.0.1:9300}{ml.machine_memory=17179869184, xpack.installed=true, testattr=test, ml.max_open_jobs=20, ml.enabled=true}, reason: apply cluster state (from master [master {node-0}{o9SuMXP-R7uvJLtE3h37Rw}{xjoT1zvpRsm1ZDGLCab1sA}{127.0.0.1}{127.0.0.1:9300}{ml.machine_memory=17179869184, xpack.installed=true, testattr=test, ml.max_open_jobs=20, ml.enabled=true} committed version [1] source [zen-disco-elected-as-master ([0] nodes joined)[, ]]])
[elasticsearch] [2018-08-04T16:42:38,317][INFO ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-0] publish_address {127.0.0.1:9200}, bound_addresses {[::1]:9200}, {127.0.0.1:9200}
[elasticsearch] [2018-08-04T16:42:38,319][INFO ][o.e.n.Node               ] [node-0] started
[elasticsearch] [2018-08-04T16:42:38,358][WARN ][o.e.x.s.a.s.m.NativeRoleMappingStore] [node-0] Failed to clear cache for realms [[]]
[elasticsearch] [2018-08-04T16:42:38,413][INFO ][o.e.g.GatewayService     ] [node-0] recovered [0] indices into cluster_state
[elasticsearch] [2018-08-04T16:42:38,597][INFO ][o.e.c.m.MetaDataIndexTemplateService] [node-0] adding template [.watch-history-7] for index patterns [.watcher-history-7*]
[elasticsearch] [2018-08-04T16:42:38,660][INFO ][o.e.c.m.MetaDataIndexTemplateService] [node-0] adding template [.watches] for index patterns [.watches*]
[elasticsearch] [2018-08-04T16:42:38,707][INFO ][o.e.c.m.MetaDataIndexTemplateService] [node-0] adding template [.triggered_watches] for index patterns [.triggered_watches*]
[elasticsearch] [2018-08-04T16:42:38,771][INFO ][o.e.c.m.MetaDataIndexTemplateService] [node-0] adding template [.monitoring-logstash] for index patterns [.monitoring-logstash-6-*]
[elasticsearch] [2018-08-04T16:42:38,836][INFO ][o.e.c.m.MetaDataIndexTemplateService] [node-0] adding template [.monitoring-es] for index patterns [.monitoring-es-6-*]
[elasticsearch] [2018-08-04T16:42:38,878][INFO ][o.e.c.m.MetaDataIndexTemplateService] [node-0] adding template [.monitoring-alerts] for index patterns [.monitoring-alerts-6]
[elasticsearch] [2018-08-04T16:42:38,926][INFO ][o.e.c.m.MetaDataIndexTemplateService] [node-0] adding template [.monitoring-beats] for index patterns [.monitoring-beats-6-*]
[elasticsearch] [2018-08-04T16:42:38,970][INFO ][o.e.c.m.MetaDataIndexTemplateService] [node-0] adding template [.monitoring-kibana] for index patterns [.monitoring-kibana-6-*]
[elasticsearch] [2018-08-04T16:42:39,055][INFO ][o.e.l.LicenseService     ] [node-0] license [79704513-d3c4-4535-8276-beeb146765de] mode [basic] - valid

6、但是我出現(xiàn)了下面這個問題，一直困擾著我呢，我是直接跳過去的。

[2018-08-01T09:44:27,370][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [] fatal error in thread [main], exiting
java.lang.NoClassDefFoundError: org/elasticsearch/plugins/ExtendedPluginsClassLoader
    at org.elasticsearch.plugins.PluginsService.loadBundle(PluginsService.java:632) ~[main/:?]
    at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:557) ~[main/:?]
    at org.elasticsearch.plugins.PluginsService.(PluginsService.java:162) ~[main/:?]
    at org.elasticsearch.node.Node.(Node.java:311) ~[main/:?]
    at org.elasticsearch.node.Node.(Node.java:252) ~[main/:?]
    at org.elasticsearch.bootstrap.Bootstrap$5.(Bootstrap.java:213) ~[main/:?]
    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:213) ~[main/:?]
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:326) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:136) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:127) ~[main/:?]
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[main/:?]
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[main/:?]
    at org.elasticsearch.cli.Command.main(Command.java:90) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86) ~[main/:?]
Caused by: java.lang.ClassNotFoundException: org.elasticsearch.plugins.ExtendedPluginsClassLoader
    at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582) ~[?:?]
    at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190) ~[?:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:499) ~[?:?]
    ... 15 more

遇到的這個問題，我在 GitHub 求助信息如下：

https://github.com/elastic/el...

但是并沒有解決我的問題，這里暫時先記錄下來！我自己也跟了下源碼，定位到錯誤信息是怎么產(chǎn)生的，但是沒有解決方案！

后面寫了篇文章：教你如何在 IDEA 遠(yuǎn)程 Debug ElasticSearch

或許可以幫你解決上面問題帶給你的困擾！

更新

后面有一個讀者提醒了我一下，他自己也遇到這個問題，然后他的解決方案挺好的，完美解決我的問題。這里做個記錄：

解決方法：?打開 IDEA?Edit Configurations?，給?Include dependencies with Provided scope?打上勾即可解決，很簡單吧??！

繼續(xù)RUN，又來一個 EXceptin：

[2018-08-23T01:13:38,551][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "createClassLoader")
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:140) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:127) ~[main/:?]
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[main/:?]
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[main/:?]
    at org.elasticsearch.cli.Command.main(Command.java:90) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[main/:?]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86) ~[main/:?]
Caused by: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "createClassLoader")
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:472) ~[?:?]
    at java.security.AccessController.checkPermission(AccessController.java:895) ~[?:?]
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:335) ~[?:?]
    at java.lang.SecurityManager.checkCreateClassLoader(SecurityManager.java:397) ~[?:?]
...

Exception: java.security.AccessControlException thrown from the UncaughtExceptionHandler in thread "Thread-2"

第一種：?在?config?目錄下新建?java.policy?文件，填入下面內(nèi)容:

grant {
    permission java.lang.RuntimePermission "createClassLoader";
};

然后在?VM options?加入?java.security.policy?的設(shè)置，指向該文件即可

-Djava.security.policy=/usr/local/elasticsearch-6.3.2/config/java.policy

第二種：?就是在?%JAVA_HOME%/conf/security?目錄下（JDK10是這個路徑，之前的版本不確定），我的目錄是?/Library/Java/JavaVirtualMachines/jdk-10.0.2.jdk/Contents/Home/conf/security，打開?java.policy?文件，在?grant?中加入下面這句，賦予權(quán)限。

//for es 6.3.2
permission java.lang.RuntimePermission "createClassLoader";

再 RUN，這次可終于運行起來了！?。?/p>

再次感謝下讀者，他的文章地址是：[http://laijianfeng.org/2018/0...]()

總結(jié)

折騰的路上少不了各種錯誤煩擾你，學(xué)會解決問題！

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