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@Typed()
public class User implements Serializable
{
    private static final long serialVersionUID = -2234530384311026364L;

    private final String id;

    public User(String id)
    {
        this.id = id;
    }

    public String getId()
    {
        return id;
    }
}

public interface Credential<T>
{
    T getValue();
}

public interface LoginCredential
{
    String getUserId();

    void setUserId(String userId);

    Credential getCredential();

    void setCredential(Credential credential);

    void invalidate();
}