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 elasticsearchTemplate

Action:

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

    @Bean
    public 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
    @Bean
    public 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);
    }

    @Bean
    public 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