Do not use subclass of EntityManager or EntityManagerFactory for injected JPA elements

When injecting a PersistenceContext or PersistenceUnit, use EntityManager or EntityManagerFactory objects, and do not use subclasses. This rule detects the presence of injected subclasses of EntityManager or EntityManagerFactory.

The following conditions will trigger the rule:

• PersistenceContext:
  • The annotation is defined on the field level.
  • The field type is not EntityManager, javax.persistence.EntityManager
• PersistenceUnit:
  • The annotation is defined on the field level.
  • The field type is not EntityManagerFactory, javax.persistence.EntityManagerFactory

The source scanner quick fix replaces those subclasses with EntityManager or EntityManagerFactory classes.

Examples:

• The rule detects this PersistenceContext code:

@PersistenceContext CustomEntityManager myMgr;

• The quick fix changes this code to:

@PersistenceContext EntityManager myMgr;

• Note: If the class does not already contain import statement of javax.persistence.EntityManager then the updated code will be similar to:

@PersistenceContext javax.persistence.EntityManager myMgr;

• The rule detects this PersitenceUnit code:

@PersistenceUnit CustomEntityManagerFactory myFactory;

• The quick fix will change this code to:

@PersistenceUnit EntityManagerFactory myFactory;

• Note: If the class does not already contain import statement of javax.persistence.EntityManagerFactory then the updated code will be similar to:

@PersistenceUnit javax.persistence.EntityManagerFactory myFactory;