连接ElasticSearch获取客户端client时报错
连接ElasticSearch时报错
2016-12-16 17:42:21 [ main:0 ] - [ org.elasticsearch.plugins.PluginsService:180] [Rachel Summers] modules [], plugins [], sites []
Exception in thread "main" java.lang.VerifyError: (class: org/jboss/netty/channel/socket/nio/NioWorkerPool, method: newWorker signature: (Ljava/util/concurrent/Executor;)Lorg/jboss/netty/channel/socket/nio/AbstractNioWorker;) Wrong return type in function
at org.elasticsearch.transport.netty.NettyTransport.createClientBootstrap(NettyTransport.java:344)
at org.elasticsearch.transport.netty.NettyTransport.doStart(NettyTransport.java:279)
at org.elasticsearch.common.component.AbstractLifecycleComponent.start(AbstractLifecycleComponent.java:68)
at org.elasticsearch.transport.TransportService.doStart(TransportService.java:182)
at org.elasticsearch.common.component.AbstractLifecycleComponent.start(AbstractLifecycleComponent.java:68)
at org.elasticsearch.client.transport.TransportClient$Builder.build(TransportClient.java:162)
at canal.canal2es.TestEs.main(TestEs.java:20)
如果是使用canal或dts等其他使用netty的依赖，可能会报以上错误，原因是netty的jar包冲突。
解决方法如下：
maven 项目，打开pom.xml，点击下面dependency Hierarchy视图，选中netty jar包。会显示引用他的层级。然后查看，如果不是elasticSearch引用的，则排除他的引用。右键netty,选择Exclude Maven Artifact...，点击OK就排除了这个jar依赖。然后再重新运行下就OK了
