ElasticSearch 5.4 客戶端訪問常見問題
阿新 • • 發佈:2019-01-23
0 概述
本文主要闡述 ElasticSearch 5.4 客戶端模式進行開發的時候出現的問題~依賴 maven pom
<!-- ES -->
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>5.4.0</version>
</dependency >
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>transport</artifactId>
<version>5.4.0</version>
</dependency>
1 常見問題以及處理
1.1 jdk版本問題
出現unsorportedClassVersion等類似問題。由於elasticsearch 5.0 以及以後版本 使用了java lambda表示式等相JDK相關特性,因此jdk 版本必須是1.8 以上版本(含1.8)。
1.2 出現log4j相關異常
at org.elasticsearch.common.logging.Loggers.getLogger(Loggers.java:105)
at org.elasticsearch.common.logging.Loggers.getLogger(Loggers.java:72)
at org.elasticsearch.common.component.AbstractComponent.<init>(AbstractComponent.java:37)
at org.elasticsearch.plugins .PluginsService.<init>(PluginsService.java:110)
at org.elasticsearch.client.transport.TransportClient.newPluginService(TransportClient.java:92)
at org.elasticsearch.client.transport.TransportClient.buildTemplate(TransportClient.java:117)
at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:241)
at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:92)
at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:81)
at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:71)
at com.hsc.study.ESClient.<init>(ESClient.java:21)
at com.hsc.study.ESClient.main(ESClient.java:26)
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:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
專案中缺少log4j2 依賴,這個是es5.4 強依賴~
解決辦法:新增如下依賴
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.6.2</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.6.2</version>
</dependency>
1.3 修改配置中叢集名字後啟動失敗
Exception in thread "main" ElasticsearchParseException[malformed, expected settings to start with 'object', instead was [VALUE_STRING]]
at org.elasticsearch.common.settings.loader.XContentSettingsLoader.load(XContentSettingsLoader.java:73)
at org.elasticsearch.common.settings.loader.XContentSettingsLoader.load(XContentSettingsLoader.java:52)
at org.elasticsearch.common.settings.loader.YamlSettingsLoader.load(YamlSettingsLoader.java:50)
at org.elasticsearch.common.settings.Settings$Builder.loadFromStream(Settings.java:925)
at org.elasticsearch.common.settings.Settings$Builder.loadFromPath(Settings.java:914)
at org.elasticsearch.node.internal.InternalSettingsPreparer.prepareEnvironment(InternalSettingsPreparer.java:102)
at org.elasticsearch.bootstrap.Bootstrap.initialEnvironment(Bootstrap.java:257)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:297)
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121)
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112)
at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54)
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122)
at org.elasticsearch.cli.Command.main(Command.java:88)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:89)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:82)
yml的配置檔案中冒號後邊要跟有 一個空格,不要出現tab符,如下:
cluster.name: test