There's a problem with spaces in the absolute jar path:
Exception in thread "main" java.io.FileNotFoundException: C:\Dokumente%20und%20Einstellungen\mhenze\Desktop\digibots-alpha2.jar (Das System kann den angegebenen Pfad nicht finden)
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(Unknown Source)
at java.util.jar.JarFile.<init>(Unknown Source)
at java.util.jar.JarFile.<init>(Unknown Source)
at org.oneclick.modules.JarFileExtractor.extract(JarFileExtractor.java:27)
at org.oneclick.launcher.OneClickLauncher.main(OneClickLauncher.java:71)
After that, I testet to execute the jar from a path without spaces and there seems to be a problem extracting the natives, also:
Chosen library path = c:\WINDOWS\system32
We are running on : windows-i386
App natives path = C:\DOKUME~1\mhenze\LOKALE~1\Temp\oneclick_org.digibots.deployment.StandAloneApp858732843-22950603-1371646720-1628558173-406851623\natives
Is list of natives null ? yes
Exception in thread "main" java.lang.NullPointerException
at org.oneclick.launcher.OneClickLauncher.main(OneClickLauncher.java:130)
and the "Please wait..."-dialog did not close on any of this errors.
Testsystem was a Windows XP notebook.
Some other notes:
- use File.pathSeparator for separating the classpaths-entries; command.append(":./") might not work on other platforms than *nix
- use new File(parentFile,"filename") instead of new File(parentFilepath + File.separator + "filename") where possible
- your random temp directory is a bit overdone, simply use "oneclick"+System.currentTimeMillis()". It's very unlikely that someone might install 2 oneclick apps in the same milisecond

Mathias