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Re:OptaPlanner – constraint solver for optimizing planning a... by mustardo on Tuesday October 13, 2020 @12:54AM (#24762399)
Another solution on the JVM for vehicle routing etc is Graph Hoppers jsprit https://github.com/graphhopper/jsprit
Re:OptaPlanner – constraint solver for optimizing planning a... by punnerud on Tuesday October 13, 2020 @01:37AM (#24762599)
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...

Re:OptaPlanner – constraint solver for optimizing planning a... by eiskalt on Tuesday October 13, 2020 @02:11AM (#24762751)
..and another solution for VRP, but on Rust: https://github.com/reinterpretcat/vrp

You can still call it from JVM using JNI

Re:OptaPlanner – constraint solver for optimizing planning a... by cerved on Tuesday October 13, 2020 @07:05AM (#24764305)
as well as Oscar-CP/CBLS, written in Scala