GrapHopper 1.0 was released on May 22, 2020.

We're currently using 0.13.0-pre13. 0.13.0 was the last final release before 1.0.

Changelog: https://github.com/graphhopper/graphhopper/blob/1.0/core/files/changelog.txt
Blog post: https://www.graphhopper.com/blog/2020/05/25/graphhopper-routing-engine-1-0-released/

Preliminary testing shows that the upgrade will include:

• Minor API changes.
• Dropping graphhopper directory (0.13 graphs cannot be loaded in 1.0).
• Usage of profiles. I wasn't able to get this working in an hour.

Useful resources:

• https://github.com/graphhopper/graphhopper/blob/1.0/reader-osm/src/test/java/com/graphhopper/GraphHopperTest.java#L231
• https://github.com/graphhopper/graphhopper/blob/master/docs/core/profiles.md
• https://github.com/graphhopper/graphhopper/blob/1.0/docs/index.md#for-developers
• https://github.com/graphhopper/graphhopper/blob/1.0/core/src/main/java/com/graphhopper/GraphHopper.java#L278