It seems the links are no longer valid since the content has been moved to vault.centos.org
Obviously just a temporary fix until we can get back to CentOS 7.7 Java.
wget http://vault.centos.org/7.6.1810/updates/x86_64/Packages/java-1.8.0-openjdk-headless-1.8.0.222.b10-0.el7_6.x86_64.rpm
wget http://vault.centos.org/7.6.1810/updates/x86_64/Packages/java-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64.rpm
Just incase anyone else was getting those 404’s