Playframework : How to share models between different projects?

Question

I want to share my Models with some other projects, they use the same models but not the same field mappings and constraints. I wonder if there is way to extract annotations from models and use xml configuration instead ? Or other way to achieve this ?

NOTE : I'm using play 1.3.

Answer 1

Last week I were analyzing something like that.

A way to archive this is:

1. generate a library (jar) for each reusable models, defined by annotations or by orm.xml files on META-INF folder (but not presistence.xml).
2. In web application project, reference required model libraries and define the entityManager using a persistence.xml on META-INF.

For more information see the JPA spec, 6.2 Persistence Unit Packaging

Other references:

• JPA - multiple jars defining @Entity objects
• JPA 2.0: Adding entity classes to PersistenceUnit *from different jar* automatically
• https://www.java.net/node/665328

Good luck!