2 versions of .jar, need to launch correct version

Question

Currently, our users are using a shortcut in Windows95/NT to launch a jar file. Now they will have two versions of the jar file, version_a.jar and version_b.jar. Now there will also need to be an ini file (or properties file) that will have four lines:
Currently Running Version
Effective Date
New Version to Run
Effective Date
I need a small program that will read this .ini file, then launch the correct jar file based on what is in the .ini file. Reading and parsing the .ini file is not a problem, I'm just not sure how to approach this small program that will launch the main program.
Has anyone done anything like this?

Answer 1

Forgive me, this is new territory for me. While my code seems to be working fine, I'm wondering what is happening with my stream handling of the process. After the System.exit(o) call, output of the process is no longer printing to the console. Should I be directing it somewhere else?
String command =
"C:\\jdk1.3.1\\bin\\javaw.exe -jar C:\\test\\test.jar";
try{
Runtime rt = Runtime.getRuntime();
Process process = rt.exec(command);
System.out.println("Running process");
StreamHandler errorHandler = new
StreamHandler(process.getErrorStream(), "ERROR");
StreamHandler outputHandler = new
StreamHandler(process.getInputStream(), "OUTPUT");
// kick them off
errorHandler.start();
outputHandler.start();
//Exit out of this launch program
System.exit(0);