解决报错Parameter 0 of constructor in XXX required a bean...elasticsearch 继承ElasticsearchConfiguration方法

SpringBoot中构建带有含参构造函数的Bean，解决报错Parameter 0 of constructor in XXX required a bean ,elasticsearch继承AbstractElasticsearchConfiguration方法…

报错内容

Description:Parameter 0 of constructor in xxx...CommonElasticsearchRepository required a bean of type 'org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate' that could not be found.The following candidates were found but could not be injected:- Bean method 'elasticsearchTemplate' in 'ElasticsearchDataConfiguration.RestClientConfiguration' not loaded because @ConditionalOnMissingBean (names: elasticsearchTemplate types: org.springframework.data.elasticsearch.core.ElasticsearchOperations; SearchStrategy: all) found beans of type 'org.springframework.data.elasticsearch.core.ElasticsearchOperations' elasticsearchOperations and found beans named elasticsearchTemplateAction:Consider revisiting the entries above or defining a bean of type 'org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate' in your configuration.

报错信息是由于ElasticsearchRestTemplate中定义了含参数的构造函数，Spring自动构造和注入时未为该Bean传入参数，引起报错。

解决方案：使用@Bean注解手动创建ElasticsearchRestTemplate的实例，具体步骤如下：

在ElasticRestClientConfig extends AbstractElasticsearchConfiguration里面添加方法即可

    @Beanpublic ElasticsearchRestTemplate elasticsearchRestTemplate() {return new ElasticsearchRestTemplate(elasticsearchClient());}

全部代码

import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.config.AbstractElasticsearchConfiguration;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;import java.time.Duration;
@Configuration
public class ElasticRestClientConfig extends AbstractElasticsearchConfiguration {@Value("${spring.elasticsearch.rest.uris}")private String url;@Value("${spring.elasticsearch.rest.username}")private String username;@Value("${spring.elasticsearch.rest.password}")private String password;@Override@Beanpublic RestHighLevelClient elasticsearchClient() {url = url.replace("http://", "");String[] urlArr = url.split(",");HttpHost[] httpPostArr = new HttpHost[urlArr.length];for (int i = 0; i < urlArr.length; i++) {HttpHost httpHost = new HttpHost(urlArr[i].split(":")[0].trim(),Integer.parseInt(urlArr[i].split(":")[1].trim()), "http");httpPostArr[i] = httpHost;}final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));RestClientBuilder builder = RestClient.builder(httpPostArr)// 异步httpclient配置.setHttpClientConfigCallback(httpClientBuilder -> {// 账号密码登录httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);// httpclient连接数配置httpClientBuilder.setMaxConnTotal(30);// 每个路由值指定最大连接数httpClientBuilder.setMaxConnPerRoute(10);// httpclient 设置保活策略｜长时间不连接es,报错超时连接 每隔五分钟发送一次请求httpClientBuilder.setKeepAliveStrategy(((response, context) -> Duration.ofMinutes(5).toMillis()));return httpClientBuilder;});return new RestHighLevelClient(builder);}@Beanpublic ElasticsearchRestTemplate elasticsearchRestTemplate() {return new ElasticsearchRestTemplate(elasticsearchClient());}
}

参考文献：https://blog.csdn.net/egg1996911/article/details/80398847
参考文献：https://blog.csdn.net/qq_24950043/article/details/125578335

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解决报错Parameter 0 of constructor in XXX required a bean...elasticsearch 继承ElasticsearchConfiguration方法

SpringBoot中构建带有含参构造函数的Bean，解决报错Parameter 0 of constructor in XXX required a bean ,elasticsearch继承AbstractElasticsearchConfiguration方法…

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