无法启动 ElasticSearch - 找不到插件类

Question

我们有一个现有的基于 Java 的 ElasticSearch 自定义插件。我们现在升级到 ElasticSearch 2.1.1 并添加了 plugin-descriptor.properties 文件来指向我们的插件类。

之后，我们就可以安装我们的自定义插件了。但是当我们启动ElasticSearch服务时，却找不到这个自定义插件。我们验证了类文件存在于 /usr/share/elasticsearch/plugins/ 目录下。

以下是异常堆栈跟踪：

[2016-01-20 13:13:48,527][ERROR][bootstrap] Exception
ElasticsearchException[Could not find plugin class [com.symc.edp.elasticsearch.plugin.CustomEDPPlugins]]; nested: ClassNotFoundException[com.symc.edp.elasticsearch.plugin.CustomEDPPlugins];
        at org.elasticsearch.plugins.PluginsService.loadPluginClass(PluginsService.java:382)
        at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:348)
        at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:109)
        at org.elasticsearch.node.Node.<init>(Node.java:146)
        at org.elasticsearch.node.Node.<init>(Node.java:128)
        at org.elasticsearch.node.NodeBuilder.build(NodeBuilder.java:145)
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:178)
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:285)
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
Caused by: java.lang.ClassNotFoundException: com.symc.edp.elasticsearch.plugin.CustomEDPPlugins
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:814)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.elasticsearch.plugins.PluginsService.loadPluginClass(PluginsService.java:380)
        ... 8 more
[2016-01-20 13:22:55,236][INFO ][node                     ] [localhost] version[2.1.1], pid[20680], build[40e2c53/2015-12-15T13:05:55Z]
[2016-01-20 13:22:55,237][INFO ][node                     ] [localhost] initializing ...
[2016-01-20 13:22:55,840][ERROR][bootstrap                ] Exception
ElasticsearchException[Could not find plugin class [com.symc.edp.elasticsearch.plugin.CustomEDPPlugins.class]]; nested: ClassNotFoundException[com.symc.edp.elasticsearch.plugin.CustomEDPPlugins.class];
        at org.elasticsearch.plugins.PluginsService.loadPluginClass(PluginsService.java:382)
        at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:348)
        at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:109)
        at org.elasticsearch.node.Node.<init>(Node.java:146)
        at org.elasticsearch.node.Node.<init>(Node.java:128)
        at org.elasticsearch.node.NodeBuilder.build(NodeBuilder.java:145)
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:178)
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:285)
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
Caused by: java.lang.ClassNotFoundException: com.symc.edp.elasticsearch.plugin.CustomEDPPlugins.class
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:814)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.elasticsearch.plugins.PluginsService.loadPluginClass(PluginsService.java:380)
        ... 8 more

以下是我们 plugin-descriptor.properties 的内容

description=EDP Custom Plugins
version=${project.version}
name=edpCustomPlugins
jvm=true
site=false
classname=com.symc.edp.elasticsearch.plugin.CustomEDPPlugins
java.version=${java.specification.version}
elasticsearch.version=2.1.1

Answer 1

可能是你对插件的打包有误。

也许您正在尝试使用已编译的类安装 jar 文件，而不是安装包含 jar 文件和 plugin-descriptor.properties 文件的 zip 文件。