Hi tbeste,
I have had the same issues on the BBB and any version of Linux for that matter. The Linux version of tgFX is just a “build” and nothing more. I made it for a few people that wanted to try it out. The only way I am able to get tgFX working on linux for now was to install netbeans and run it from netbeans. Sub-optimal on the BBB as the Netbeans overhead is really too much. So consider Linux support at the moment “sketchy”.
You are on uncharted waters as of now. If you are able to get it working cool. Please let me know. For now I am almost positive you will need Java (oracle version) 7 that includes Javafx2 (comes with java 7 so should be bundled). From there I assume there is something messed up with the JAVA_HOME environment variable. But that is just a guess.
Riley
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