Edit source files with custom maven archetype

Question

I have created a customer maven archetype and have it setup with some custom requiredProperties:

<requiredProperties>
    <requiredProperty key="classPrefix" />
</requiredProperties>

I can use that property to name a file, like so:

__classPrefix__Config.java

My question is can I use that property inside the file. I've tried the following two variations but neither work:

public class ${classPrefix}Config
public class __classPrefix__Config