> Can Y use Sun Microsystem JVM without pay anything for
> it? I Know that this JVM isn't free software.
> Do Y need to pay anything for Sun for build small
> applications for my company?

You do not need to pay Sun for JRE when you want to run Java applications.
You do not have to pay Sun for JDK when you want to develop Java
applications. But you are not allowed (as far as I remember the license
agreement) to redistribute the JRE/JDK without Sun permission.

Roman