[CentOS] environment-modules

We've got a developer here who needs to use both java and openjdk. I was
giving her sudo for alternatives, but my manager would prefer that I look
into environment-modules. I've installed it, and I see it comes with
configurations for cvs and info... but nothing for java, and the man pages
doesn't seem to offer info on creating one.

Does anyone have a pointer to a howto, or maybe even a sample one?

Thanks in advance.

       mark