crawler crashes JVM on ppc64le/ubuntu 18.04

[kgardas]

Hello,

I'm testing yacy on ppc64le VM and I got following crash on it.

I know, JVM should be crash proof so it'll probably be more accurate to report to ubuntu ppc64le team but still, sometimes such issues are platform independent and perhaps already seen.

The gist of the crash file is here: https://gist.github.com/kgardas/8e6729e2ccb59a1778fd98952d4d665a