clear the java cache from the command line in linux

The title says it all. I have to clear the java cache (to load a fresh version of an applet) from the command line, and the command line only, without any GUI.

I tried something found here https://stackoverflow.com/a/25807154/4142984

javaws -clearcache

But it opens a GUI that leads me to a window for the Java Control Panel.

The window (seen remotely on a windows machine) is non-resizable, and the interesting buttons from "Temporary Internet Files" are not in the visible part of the window.