<p>I am using Struts + Velocity in a Java application, but after I submit a form, the confirmation page (Velocity template) shows the variable names instead an empty label, like the Age in following example:</p>
<blockquote>
<p><strong>Name</strong>: Fernando</p>
<p><strong>Age</strong>: {person.age}</p>
<p><strong>Sex</strong>: Male</p>
</blockquote>
<p>I would like to know how to hide it!</p>

You can mark variables as "
silent
" like this:
```
```
$!variable
```
```
If $variable is null, nothing will be rendered. If it is not null, its value will render as it normally would.