It is an unfortunate thing, that those who are expert* on Visual
Age are not necessarily knowledgable of JNI (or Java in general),
while those able to assist* with JNI, will generally talk about
how you might 'do it from the command line', while expecting
you to 'adapt to your environment' as needed.

* I can help with neither, I'm just an interested observer..

Either do it with an ant script something like this:

<!-- J A V A H -->
<target name="javah" depends="compile">
 <javah class="${main.class}"
outputfile="${package.dir}/native${ant.project.name}/${ant.project.name}.h"
/>
</target>

or just run javah from the command line. You only have to run it if
you change the API to your native classes. You don't need to run it if
you just change you JNI implementation.

Why should you want to do that ?  What's the problem with just running javah
from the command line.

BTW, are you talking about VAJ (the long dead "Visual Age for Java" IDE), or
one of the other products in the "Visual Age" line ?

   -- chris