-import static org.argeo.cms.internal.kernel.KernelConstants.SPRING_SECURITY_CONTEXT_KEY;
-
-import javax.servlet.http.HttpSession;
-
+import java.io.IOException;
+
+import javax.security.auth.Subject;
+import javax.security.auth.callback.Callback;
+import javax.security.auth.callback.CallbackHandler;
+import javax.security.auth.callback.NameCallback;
+import javax.security.auth.callback.PasswordCallback;
+import javax.security.auth.callback.UnsupportedCallbackException;
+import javax.security.auth.login.LoginContext;
+import javax.security.auth.login.LoginException;
+
+import org.argeo.ArgeoException;