How to clone a JPA entity
clone, entity, java, jpa, orm
Solution
Use `EntityManager.detach`. It makes the bean no longer linked to the EntityManager. Then set the Id to the new Id (or null if automatic), change the fields that you need and persist.
Problem
I have a JPA entity already persisted in the database. I would like to have a copy of it (with a different id), with some fields modified. What is the easiest way to do this? Like: - setting it's `@Id` field to `null` and persisting it will work? - will I have to create a clone method for the entity (copying all fields except the `@Id`)? - is there any other approach (like using a cloning framework)?