PasswordResetPage.java

public class PasswordResetPage ... implements HasParameters<PasswordResetPage.Params> {
    ...
        
    public class Params extends PageParams {

        public Params(String emailAddress) {
            emailAddress(emailAddress);
        }

        public Params emailAddress(int emailAddress) {
            return (Params) add(new PageParam<>("emailaddress", emailAddress));
        }
    }

    ...
}

navigator.goTo(PasswordResetPage.class, new PasswordResetPage.Params("myaddy@gmail.com"));