Reloading failure to creat users with Java dynamically

[sfwang]

I followed the post titled "Dynamic user creating with PHP" ,trying to create users dymamically.
Everything goes well except that when I call ("*/FileZilla Server.exe","/reload-config") using Runtime.getRuntime().exec() in Java, it just does not work. On XP the exit value returned by waitFor() is 1 while on Win7 it's 0.
But when I manually run -- "D:\Program Files\FileZilla Server\FileZilla Server.exe" /reload-config -- in cmd window as well as called by system() in C/C++, it works perferct. Does anyone meet with the same problem?