Java seems to be difficult. I remember there are a thread that try to say how one can successfully do get it to work. But I am not motivated enough to spend time searching for it. I hope you have that motivation though.trying to get a Java app to run, unsuccessfully so far
Wow you are a HAM radio operator. I admired such for some 55 years or so.
I desperately asked the military to teach me Morse or CW but I was not fit for the elite. To bad performance getting the code. So no license for me.
Yes I know there are licenses for us who don't get morse too.
I've listen to G amateurs since 1960 at least but I am only doing internet now and no shortwave. Too much QRM from all computers and TV.
Good luck