Re: Singleton Class in Development Mode

Assuming this is on the client side, each refresh gets its own ClassLoader. So, you won't be able to persist state on the client across a refresh this way. The VM is not spun up again, but the effect is similar for this use case.

On Wed, Sep 22, 2010 at 12:34 PM, Moshe Solomon <udeleng@gmail.com> wrote:

I'm not sure if this is because of the GWT plugin, but maybe you guys
know...

I have a Singleton class which I use to store the user authentication.
But When I reload my page (with F5) the singleton is reloaded, as if
the VM is restarted.

public class AuthenticationManager {

       private static final AuthenticationManager m_instance = new
AuthenticationManager();

       private boolean m_authenticated = false;

       private AuthenticationManager() {
               System.out.println("AuthenticationManager Constructor");
       }

       public static AuthenticationManager getInstance() {
               return m_instance;
       }

       public boolean isAuthenticated() {
               return m_authenticated;
       }

       public boolean authenticate(String uid, String pwd) {
               if (uid != null && uid.trim().length() > 0) {
                       if (pwd != null && pwd.trim().length() > 0) {
                               return (m_authenticated = true);
                       }
               }
               return false;
       }
}

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