PDFsam is developed using Java 8 and JavaFX. It should work on higher versions provided they come with their JavaFX, as far as I know Oracle JDK still bundles JavaFX, with a plan to separate the two soon. OpenJDK already separated JavaFX available through the package OpenJFX but from what I can see, the package in the repo https://packages.debian.org/sid/openjfx is for OpenJDK 8. What happens is that PDFsam starts with a higher version of OpenJDK (on my brand new box is OpenJDK 11) for which there is no OpenJFX. A quick fix would be to force the dependencies to openjdk-8-jre + openjfx
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