difference in java and vb for invoking the exec

hi all

I am having an application of invoking a fortran program using java. i.e by writing a interface that takes the input and give the input to the fortran program. But now i am stuck with a problem..that What to use java or vb inorder to make this programs web enable. now my question is .. which will sute best in invoking an exec with a separate process. if so can u suggest me why and how? what are the differences in java and vb why one having a more advantage.. your help is very much needed. thanks in advance.
bye
venkat