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

An automatic fix will replace those subclasses with EntityManager or EntityManagerFactory classes.

Examples:

• The rule detects this PersistenceContext code:
@PersistenceContext
CustomEntityManager myMgr;
• The automatic fix will make changes this code to:
@PersistenceContext
EntityManager myMgr;
• Note: If the class does not already contain import statement of javax.persistence.EntityManager then your updated code will be similar to:
@PersistenceContext
javax.persistence.EntityManager myMgr;
• The rule detects this PersitenceUnit code:
@PersistenceUnit
CustomEntityManagerFactory myFactory;
• The automatic fix will make changes 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;