You might be using the wrong way to add commands to the command line. Try using commandDownloader.add("command");
If you're trying to make a splash screen, check this tutorial: https://goo.gl/zQyCYe
You have a different solution? A short tip here would help you and many other users who saw this issue last week.
- java.io.IOException: Cannot run program "uname" (in directory "."): error=0, spawn failed at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048) at java.lang.Runtime.exec(Runtime.java:620)