[jboss-user] [JBoss Seam] - Re: servlet in seam application

[Basel]

Injecting an EntityManager into a servlet is not recommended since the former is not thread safe. Here is what I do in my current web application:


  | @PersistenceUnit(name = "myPU")
  | private EntityManagerFactory factory;
  | 
  | protected void doGet(HttpServletRequest request,
  | 	HttpServletResponse response) throws ServletException,
  | 		IOException{
  | 	try{
  | 		if(factory == null){
  | 			String name = "java:/myEntityManagerFactory";
  | 			factory = (EntityManagerFactory)
  | 				Naming.getInitialContext().lookup(name);
  | 			}
  | 			if(em == null){
  | 				em = factory.createEntityManager();
  | 			}
  | 		}
  | 	}catch(NamingException e){
  | 		err.println("NamingException when trying to get an " +
  | 			"EntityManager: "+e.getMessage());
  | 		e.printStackTrace();
  | 	}
  | }
  | 
  | 
  | 

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