see: https://issues.jboss.org/browse/ENTESB-3938 - this bug targets just the openstack users afaik.

The workaround is to add -Djava.security.egd=file:/dev/./urandom(with the dot too) to java options, but it can be treated as a security flaw, because /dev/urandom is faster, but less random than the default /dev/random.

It would be good to include this note somewhere in the doc