Use this command to produce enough entropy for the SecureRandom(on Linux machines, obviously):
sudo rngd -r /dev/urandom

java -jar jpwgen-x.x.xx.jar -N 60 -s 10 -C -Y -S SHA1PRNG SUN

java -jar jpwgen-1.4.0.jar -N 10 -s 8 -C -c -y