Has your support ticket been answered/solved?
Yes. Ricoh is nice enough to ship multiple Java versions on their JavaCARDs. The machine that was giving us the most trouble needed an update to 10.15 in order to function. The 1.4.9 iMFP software did allow me to push the installation to this machine with an old Java version, which is why I couldn't wrap my head around why it would successfully install but not work as expected.
My Ricoh techs were nice enough to send me the Java updaters from Ricoh's TSCweb for all the JavaCARD versions that I have in my fleet, so if it happens again, I can just flash with the latest version without incurring a service call.