This is a refreshingly focused little Java service that answers a deceptively simple question: can I get from station A to station B on a single bus route? Built around GTFS (General Transit Feed Specification) data and exposed over a clean REST API using Spring, it tackles a problem that sounds trivial until you actually try to model it well.

What makes this repo interesting is its narrow scope done right. Rather than trying to be a full-blown trip planner with transfers, fares, and real-time data, it focuses on the connectivity primitive — the building block that more elaborate transit tools depend on. The topic tags (gtfs, java, rest-api, routing, spring, transit) hint at an author who knows the transit-data ecosystem and isn't reinventing wheels.

Who would benefit from poking around here:

• Backend engineers learning Spring — a real domain problem is far more instructive than another todo-list tutorial.
• Civic tech and open-transit contributors who want a minimal reference for parsing and querying GTFS feeds.
• Interview prep folks — graph-style connectivity questions are classic, and seeing one wrapped in a production-shaped HTTP service is genuinely useful.
• Anyone running a small municipal transit prototype who needs a starting skeleton rather than a 50k-line monolith.

The fact that it's a small HTTP service (the author's own framing) is the selling point. You can read it end-to-end in an afternoon, understand every design choice, and either extend it or steal the patterns for your own GTFS work. Zero stars feels unjust for something with this much practical clarity — it's the kind of repo that quietly underpins real-world side projects.