gradle or maven asciidoctor build with kroki diagrams

Does any one have a working build using maven or gradle to build asciidoctor pdfs with kroki generated diagrams.  After hacking around  setting up node and various other tools I can sort of get some diagrams generated for an asciidoctor jenkins build, but it would be so much more convenient if I could point my build at a kroki server for the diagrams.

Thanks,
Dave