Googling yeilded this thread:

http://stackoverflow.com/questions/22085552/unsatisfied-link-error-runnable-jar-referencing-jssc-library

It seems to suggest some people solved their issue by reinstalling java, and one purports to have snagged the armhf.so file out of the jssc jar, placing that into the .jssc/linux/ directory and that solved his problem.

To unzip a jar you can:

cd Mango/lib; mkdir jssc; cp jssc-* jssc; cd jssc; unzip jssc*; #Files should now be in libs/linux/ if you need to grab them