https://github.com/spring-projects/spring-framework: Spring Core (Spring IO)
  • Juergen Hoeller 
Spring's environment abstraction consisting of bean definition
profile and hierarchical property source support.

/**
 * Spring's environment abstraction consisting of bean definition
 * profile and hierarchical property source support.
 */
@NonNullApi
@NonNullFields
package org.springframework.core.env;

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