How to avoid SSL validation in Spring restclient

 Here is an example to disable SSL validation while calling https based URL

package com.techtx.testproject;

import org.apache.hc.client5.http.impl.DefaultHttpRequestRetryStrategy;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.client5.http.impl.classic.HttpClients;
import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManager;
import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManagerBuilder;
import org.apache.hc.client5.http.io.HttpClientConnectionManager;
import org.apache.hc.client5.http.ssl.SSLConnectionSocketFactory;
import org.apache.hc.client5.http.ssl.SSLConnectionSocketFactoryBuilder;
import org.apache.hc.client5.http.ssl.TrustAllStrategy;
import org.apache.hc.core5.ssl.SSLContexts;
import org.apache.hc.core5.util.TimeValue;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestClient;

import javax.net.ssl.SSLContext;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;

public class ApiIntfService {


    public String callAPI()
    {
        final SSLContext sslContext;
        try {
            sslContext = SSLContexts.custom().loadTrustMaterial(null, new TrustAllStrategy()).build();
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        } catch (KeyManagementException e) {
            throw new RuntimeException(e);
        } catch (KeyStoreException e) {
            throw new RuntimeException(e);
        }

        final SSLConnectionSocketFactory socketFactory = SSLConnectionSocketFactoryBuilder
                .create().setSslContext(sslContext).build();

        final HttpClientConnectionManager cm = PoolingHttpClientConnectionManagerBuilder
                .create().setSSLSocketFactory(socketFactory)
                .build();

        CloseableHttpClient httpClient = HttpClients.custom()
                .setConnectionManager(cm)
                .setRetryStrategy(new DefaultHttpRequestRetryStrategy(3, TimeValue.ofMilliseconds(1000)))
                .evictExpiredConnections().build();

        HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
        requestFactory.setHttpClient(httpClient);

        RestClient restClient = RestClient.builder().requestFactory(requestFactory).build();
        ResponseEntity entity = restClient.get().uri("https://api.restful-api.dev/objects")
                .retrieve()
                .toEntity(String.class);

        System.out.println(entity.getStatusCode());
        System.out.println(entity.getBody());

        return entity.getBody();
    }
}

Here the apache httpclient is used as request factory and included in pom xml as dependency.

	<dependency>
            <groupId>org.apache.httpcomponents.client5</groupId>
            <artifactId>httpclient5</artifactId>
            <version>5.3.1</version>
        </dependency>