Runtime.exec fails to launch C++ application

Question

A java application launches a C++ Windows based application, providing it with arguments on the command line. This application is supposed to start, to execute something and to exit.
This is working as long as the java code runs from the command prompt.
When the java code is running as part of a Java Windows 2000 service, the C++ application starts but enters a loop and never returns. It consumes all CPU and waits for something that I could not figure out. I can just see the process in the Task Manager.
Windows 2000 service is configured as loging on a user account.
I have not the code of the C++ application and cannot modify it.
Here is the piece of code that starts this C++ Application :
//Start the command and wait for completion
try{
java.lang.Process submitProcess = Runtime.getRuntime().exec(command);
submitProcess.waitFor();
if(submitProcess.exitValue() == 0){
return;
} else{
System.out.println("exitValue = " + submitProcess.exitValue());
} catch(Exception e){e.printStackTrace();

Answer 1

For information, wrapping input and error streams did not return any information.
Doing further testing, I found that this application - a viewer that I use for its command line print functionality- starts looping when I pass as argument a DWG file. If I ask it to print .DOC or .XLS or .HTML ... files, it works.
If I start the application from Java code at command prompt, it works even with this DWG file and it does not ask for anything.
My conclusion is that the loop comes from a component used for Autocad conversion when the Java code launching the application is started as Windows 2000 service.