elasticsearch 5.5使用TransportClient初始化抛异常

elasticsearch 5.5使用TransportClient初始化抛异常

es版本说明

• elasticsearch 5.5.3版本

maven依赖包

• elasticsearch java client包

<dependency>
      <groupId>org.elasticsearch.clientgroupId>
      <artifactId>x-pack-transportartifactId>
      <version>5.6.0version>
dependency>

• netty依赖包

<dependency>
    <groupId>io.nettygroupId>
    <artifactId>netty-allartifactId>
    <version>4.1.13.Finalversion>
dependency>

初始化client异常信息

elasticsearch 集群安装x-pack插件，如果直接使用TransportClient无法连接到es集群，需要使用XPackTransportClient进行连接，需要添加x-pack-transport包，添加完后初始化client时抛出以下异常信息:

Caused by: java.lang.NoSuchMethodError: io.netty.util.internal.ObjectUtil.checkPositive(ILjava/lang/String;)I
    at io.netty.util.NettyRuntime$AvailableProcessorsHolder.setAvailableProcessors(NettyRuntime.java:44) ~[netty-common-4.1.13.Final.jar:4.0.33.Final]
    at io.netty.util.NettyRuntime.setAvailableProcessors(NettyRuntime.java:87) ~[netty-common-4.1.13.Final.jar:4.0.33.Final]

解决方法，只需要在初始化方法前添加

// 避免netty冲突
System.setProperty("es.set.netty.runtime.available.processors", "false");

解决netty冲突后初始化client时还会抛出异常，异常信息如下:

Caused by: java.lang.NoSuchMethodError: io.netty.buffer.CompositeByteBuf.addComponents(ZLjava/lang/Iterable;)Lio/netty/buffer/CompositeByteBuf;
    at org.elasticsearch.transport.netty4.Netty4Utils.toByteBuf(Netty4Utils.java:117) ~[transport-netty4-client-5.6.0.jar:5.6.0]
    at org.elasticsearch.transport.netty4.Netty4Transport.sendMessage(Netty4Transport.java:395) ~[transport-netty4-client-5.6.0.jar:5.6.0]

netty版本冲突，低版本的netty启动时会抛异常，需要添加高版本的netty依赖，请看maven依赖包 项，将两项添加到你的pom.xml既可，如果还有问题请留言