https://github.com/spring-projects/spring-framework: Spring Web MVC (Spring IO)
  • Juergen Hoeller 
Support package for annotation-based Servlet MVC controllers.

/**
 * Support package for annotation-based Servlet MVC controllers.
 */
@NonNullApi
@NonNullFields
package org.springframework.web.servlet.mvc.annotation;

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