All Optaplanner examples need to have a fully functional Constraint Provider implementation, on par with either the DRL or the easy Java calculator.
All solver/benchmark configs for every example need to be updated to include the provider.

Recommended approach:

• Take DRL and replicate it with the Constraint Streams API.
• Configure solver to use the DRL as an asserting score director, to make sure both CS and DRL give the same scores.
• Write a test for the constraint provider, using the Constraint Verifier API.
• Possibly optimize the ConstraintProvider now that you have a functional, regression-tested version.
• If you find something that is either too hard to do or even impossible in the CS API, contact lpetrovi@redhat.com.