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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