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Entity Beans in combination with an EntityManager

use CDI to inject the EntityManager into my JpaRealm

JpaRealm is not container managed but is instantiated by Shiro

delegate your JpaRealm into @Stateless EJB, which can @Inject EntityManager

JpaRealm

@PersistenceContext   private EntityManager entityManager;

EnvironmentLoaderListener

found the cause

Instead of configuring the ShiroFilter in my web.xml I had the IniShiroFilter configured. The IniShiroFilter creates a new SecurityManager from the ini file. This new SecurityManager didn't know about the realm I've added in my EnvironmentLoader, so it didn't have any realms.

I replaced it with the ShiroFilter in my web.xml and all seems to be working now with my CdiEnvironmentLoaderListener.

Example of injecting an EntityManager and EntityManagerFactory in a SessionBean

@Stateless

@PersistenceContext(unitName="acme") private EntityManager entityManager;