FYI, I had a look at the latest version and worked on a new debian package which can be found at
https://anonscm.debian.org/cgit/pkg-java/pdfsam.git (might take a few minutes until it is accessible) pdfsam is now a JavaFX application and requires at least https://github.com/torakiki/sejda https://github.com/haraldk/TwelveMonkeys as new build-dependencies. I think it would be a nice goal for Buster to package those for Debian. No solution for bug #855324 yet.
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