Some Apps need Java to work.
Most of them needs an actual JRE, which is also a much smaller installation-file than the full JDK.
The JRE has also its own directory at sourceforge: https://sourceforge.net/projects/portableapps/files/OpenJDK%20JRE%20Port...
But in the App directory I can only find the JDK version to download, not the JRE (or maybe I'm to blind to see it.)
Maybe the JRE version can be listed in the app directory as separate App, for easy downloading and installation?