Right now, when the Registration page is rendered, none of the radio buttons are selected. If you want, you can provide a default option by giving the gender property an initial value, like this:

private String gender = "F";

Now the radio button labeled "Female" will be pre-selected.

The page works properly, but having a gender specified as an arbitrary string isn't a good design. For a set of mutually exclusive options like this, it would be better to have an enumeration. So let's add the following simple enumeration to the com.packtpub.celebrities.model package:

package com.packtpub.celebrities.model;
public enum Gender
{
MALE, FEMALE
}

We can now modify all the gender-related code to work with the new Gender type instead of String:

private Gender gender;
...
public Gender getGender()
{
return gender;
}
public void setGender(Gender gender)
{
this.gender = gender;
}

In case you want to provide a default value, you can do it like this:

private...