To get the actual zwoggel-ca master certificate use e.g.

wget -q https://zwoggel.net/ca.zwoggel.net.crt

= To install it in linux system wide= copy it to /etc/ssl/certs/ and trigger the certificate update process. With debian:

update-ca-certificates

But for debian you could also use the method described in ZwoggelDebian.

To make a java jre trust zwoggel use

sudo keytool -import -trustcacerts -alias zwoggel.net -file <PATHTO>/ca.zwoggel.net.crt -keystore lib/security/certs

using default password “changeit” in the jre's home directory.