JPA exception: Object: … is not a known entity type

Question

I\'m new to JPA and I\'m having problems with the autogeneration of primary key values.

I have the following entity:

package jpatest.entities;

impor         


        

Answer 1

I also have to add one other item to my persistence.xml when changing class/table defs so that the EM knows to build/update tables:

If I want a fresh start, I instead use:

I noticed that in your persistence.xml schema management is only set to "create tables" as opposed to drop/create, or update