java - How to enforce TLS1.2 to Rest client using Rest Template

Question

I am consuming json webservice using Spring3.0 restTemplate by calling post method.

        MultiValueMap<String, String> headers = new LinkedMultiValueMap<String, String>();
        headers.add("Content-Type", MediaType.APPLICATION_JSON_VALUE);      
        HttpEntity<Object> entity = new HttpEntity<Object>(requestAsString, headers);
        postForObject = restTemplate.postForObject(url, entity, responseClass );

Our application is deployed in WAS server and trying to connect producer by creating socket connection with TLS1.0. However, now producer only supports TLS1.1 and TLS1.2.

How to enforce restTempate to use TLS1.1 or TLS 1.2.

Normally for apache httpclient code , create custom ProtocolSocketFactory and override createSocket method. However , in case of RestTemplate , how to achieve same.

Answer 1

With Spring > 3.1:

import javax.net.ssl.SSLContext;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

SSLContext context = SSLContext.getInstance("TLSv1.2");
context.init(null, null, null);

CloseableHttpClient httpClient = HttpClientBuilder.create().setSSLContext(context)
    .build();
HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(httpClient);
RestTemplate restTemplate = new RestTemplate(factory);
.....