Problems with exec function

Hello. I have a problem in my project. I want to execute a file from java (to be more exact java servlet). I've made the next function for that:
public boolean executaComanda(String comanda){
boolean status=true;
Runtime r = Runtime.getRuntime();
Process p = null;
try{
// p = r.exec("rundll32 SHELL32.DLL,ShellExec_RunDLL "+comanda);
p = r.exec("cmd /c "+comanda);
status=true;
} catch (Exception e) {
...
status=false;
}
return status;
}

The function works (in a way) but the problem is that the file is run like a process and the application's form does'n apear.
How can I do to make the form visible and the file to run as an application?

Thanks for any help.