We have seen this every now and then,
that JMC does not start, and when you have a look in the jmc.ini you see that
the line after '-vm' in the jmc.ini file is just blank.

Opening this just to keep track.
Most recently saw this in JMC-5975, where this occured after I had installed a plug-in, done restart, and then manually closed and started JMC again.