Zend certified PHP/Magento developer

Ubuntu 19 Java JAR (Java 8) GUI blank screen

I’m trying to launch a JAR file which requires Java 8 (not higher/lower). When I install Java 8 and I launch the application it opens a window but the content of the window is just blank. I’ve tried the openjdk aswell as the oracle jdk. None of them work.

However when I tried Java 11 the application launched with GUI (and all input fields,..) but crashed when launching the next screen providing an error to install Java 8 as Java 11 is not supported.

The machine is a dedicated server with Ubuntu 19.10, 32GB of ram and an Intel Xeon E3-1245.