Title: hibernate.org - Equals and HashCode

URL: https://www.hibernate.org/109.html

Description: Java's Collections and Relational database (and thus Hibernate) relies heavily on being able to distinguish objects in a unified way. In Relational database's this is done with primary keys, in Java we have equals() and hashCode() methods on the objects. This page tries to discuss the best strategies for implementation of equals() and hashcode() in your persistent classes.