With EJB3 the application server makes sure that your methods are executed 
within a transaction. This is not the case with Servlets so you have to start 
and commit the transaction yourself. Here is the code:

  | UserTransaction utx = Transactions.getUserTransaction();
  | if(utx.getStatus() != Status.STATUS_ACTIVE)
  |     utx.begin();
  | em.joinTransaction();
  | utx.commit();
  | 
The if statement is not required however I needed that in my web application 
due to an exception that I don't recall right now.

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