Travel example does not build

[anyachopra97]

When I try to build, I get the following error:

Could not find type, field, or local variable "fabric.util.Map_JIF_IMPL".

[tmagrino]

As a note for myself as I figure this out, the bug was introduced by 8f662a9, which I wrote to work around issues I was having with FabFX. I'm currently considering reverting that commit, but I want to check that doesn't cause things to break for the current state of FabFX.