Tested to work. Thank you!
Yes, I am sure. Tested again and it died. Digging into this further, different class...
I googled around a bit, and here is a way to check the byte code version: $ jar xf...
Sorry, the new file has the same problem as the previous one. $ java -jar LIBS/hfst-ol.jar...
hfst-ol.jar fails on machines running Java 1.6 and below