I follow the tutorial
http://www.developer.com/java/web/article.php/10935_3673576_1 to learn how to
use wicket. And I want to practise not to embed the Form inside another class.
So I create a class called LoginForm.java and move the code to there (as
follow).
public class LoginForm extends Form {
public LoginForm(String id) {
super(id);
}
@Override
public void onSubmit() {
Object o = get("packageName.to.Login");
System.out.println("object:"+o.getClass().getSimpleName());
(Login (o)).getUserId();
(Login (o)).getPassword();
}
}
However, after submit the form, I get the a NullPointerException error because
the object o is null. How can I obtain the component of Login? Or how can I use
the method of Login?
Thanks in advice,
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