https://github.com/spring-projects/spring-framework: Spring Web (Spring IO)
  • Juergen Hoeller 
Classes supporting the org.springframework.web.client package. Contains a base class for RestTemplate usage. 
/**
 * Classes supporting the {@code org.springframework.web.client} package.
 * Contains a base class for RestTemplate usage.
 */
@NonNullApi
@NonNullFields
package org.springframework.web.client.support;

import org.springframework.lang.NonNullApi;
import org.springframework.lang.NonNullFields;