Problem while calling Configuration constructor (Hibernate)

Hello everybody,
I'm trying to use for the first time hibernate so if my question is
dumb, please let me now.
I would like to perform some simple task through hibernate and
therefore I generated hbm.xml, java and mapping file through JBOSS
Eclipse starting from a pre existing database.
When I try to perform configuration my system stop working. In order to
implement configuration I use the ollowing class:

public class init_system {

  /** Creates a new instance of init_system */
  public init_system() {
  }

  public static void initialization()
  {
    try
    {
      Configuration cfg = new Configuration(); LINE A

//------------------------------------------------------------------------
      // Test x HIBERNATE
      cfg.addClass(com.biz.hibernate.Money.class);
      cfg.addClass(com.biz.hibernate.Useraccesstable.class);
      cfg.addClass(com.biz.hibernate.Userinfo.class);

      SessionFactory factory = cfg.buildSessionFactory();

      // FINE Test x HIBERNATE
    }
    catch(HibernateException ex1)
    {
      ex1.printStackTrace();
    }
    catch(Exception ex)
    {
      System.out.println("Merda");
    }
  }
}

When I try to use the initialization() method from inside a web
application, the code run until LINE A, and then stops (also the
JavaBean calling it). However it doesn't enter the catch instructions.
The initialization method is called inside a JavaBean used by a JSP
page. I know this is not the correct way to perform the configuration
task because this is a heavy task, however, can this explain the error
in my code?
Please note that my code doesn't reach the cfg.AddClass()
Thanks a lot Gio