GraphHopper is one of the engines within OptaPlanner. You still need OpenStreetmap integration and visualization, this is where OptaPlanner comes in.

See section 2.2: https://docs.optaplanner.org/7.36.0.Final/optaweb-vehicle-ro...

..and another solution for VRP, but on Rust: https://github.com/reinterpretcat/vrp

You can still call it from JVM using JNI

as well as Oscar-CP/CBLS, written in Scala