import java.security.PrivilegedExceptionAction;
import java.util.UUID;
+import java.util.concurrent.Callable;
import javax.security.auth.Subject;
import javax.security.auth.login.LoginContext;
return uid;
}
+ @Override
+ public <T> T doAs(Callable<T> action) {
+ throw new UnsupportedOperationException();
+ }
+
}