https://github.com/spring-projects/spring-framework: Spring Object/Relational Mapping (Spring IO)
  • Juergen Hoeller 
Root package for Spring's O/R Mapping integration classes.
Contains generic DataAccessExceptions related to O/R Mapping.

/**
 * Root package for Spring's O/R Mapping integration classes.
 * Contains generic DataAccessExceptions related to O/R Mapping.
 */
@NonNullApi
@NonNullFields
package org.springframework.orm;

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