The best way to implement equals, hashCode, and toString with JPA and Hibernate

Bytecode enhancement and toString Last week, Mark Struberg, who is an Apache Software Foundation member and OpenJPA contributor, made the following statement:

How to implement equals and hashCode using the JPA entity identifier (Primary Key)

Introduction As previously explained, using the JPA entity business key for equals and hashCode is always best choice. However, not all entities feature a unique business key, so we need to use another database column that is also unique, as the primary key. But using the entity identifier for equality is very challenging, and this post is going to show you how you can use it without issues.