SpringBoot集成ElasticSearch出现的异常_继承elasticsearchrepository报error creating bean-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_41800884/article/details/107885391

本文讲述了在SpringBoot 2.2.8版本集成ElasticSearch 6.8.10时遇到的Netty冲突问题，由于ElasticSearch和Redis底层都使用Netty，导致启动异常。解决方案是在启动类中通过设置es.set.netty.runtime.available.processors为false避免冲突。同时提醒注意ElasticSearch版本一致性，避免6版和7版混用。

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1. 异常

在使用springboot2.2.8+elasticsearch6.8.10时，测试时报错：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'elasticsearchClient' defined in class path resource [org/springframework/boot/autoconfigure/data/elasticsearch/ElasticsearchAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.elasticsearch.client.transport.TransportClient]: Factory method 'elasticsearchClient' threw exception; nested exception is java.lang.IllegalStateException: availableProcessors is already set to [4], rejecting [4]

2. 原因

Elasticsearch 和 Redis 底层都使用到了 Netty , 在项目启动时会冲突。

涉及到的类：NettyRuntime，Netty4Util。

查看NettyRuntime类，可以看下源码:

public final class NettyRuntime {
   
    private static final NettyRuntime.AvailableProcessorsHolder holder = new NettyRuntime.AvailableProcessorsHolder();

    public static void setAvailableProcessors(int availableProcessors) {
   
        holder.setAvailableProcessors(availableProcessors);
    }

    public static int availableProcessors() {
   
        return holder.availableProcessors();
    }

    private NettyRuntime() {
   
    }

    static class AvailableProcessorsHolder {
   
        private int avail