java - Inject PersistenceContext with CDI -

currently, i'm using persistencecontext inject entitymanager. em injected perfectly.

@stateless public statelesssessionbean implements statelesssessionbeanlocal {      @persistencecontext(unitname = "mypersistenceunit")     private entitymanager em;      @override     public collection<myobject> getallobjects(){         criteriabuilder cb = em.getcriteriabuilder();         criteriqquery<myobject> query = cb.createquery(myobject.class);         query.from(myobject);         return em.createquery(query).getresultlist();     } } 

now try decorate bean, , em doesn't injected. nullpointerexception.

@decorator public statelesssessionbeandecorator implements statelesssessionbeanlocal {      @inject     @delegate     @any     statelesssessionbeanlocal sb      @override     public collection<myobject> getallobjects(){         system.out.println("decorated method!");         return sb.getallobjects();     } } 

i know ejb , cdi 2 different managers, 1 doesn't know other. i'm expecting @persistencecontext ejb injection point, while @inject cdi one. should solve , entitymanager injected should?

the best practice persistence context , cdi make them cdi bean avoid these kind of issue.

public class myproducers {     @produces     @persistencecontext(unitname = "mypersistenceunit")     private entitymanager em; } 

after you'll able inject entitymanager in cdi way. taking ejb it'll :

@stateless public statelesssessionbean implements statelesssessionbeanlocal {      @inject     private entitymanager em;      @override     public collection<myobject> getallobjects(){         criteriabuilder cb = em.getcriteriabuilder();         criteriqquery<myobject> query = cb.createquery(myobject.class);         query.from(myobject);         return em.createquery(query).getresultlist();     } } 

this way, you'll able decorate cdi bean no issue.

if have multiple entitymanagers can use cdi qualifiers distinguish them