Forum Discussion
Implementing the TSP with DFJ subtour elimination constraints
To learn how callbacks work in Xpress, based on the answer by Daniel Junglas in this question: https://community.fico.com/s/question/0D54W00008P73MsSAJ/lazy-cut-callback-in-java, I've been experiment...
I found the issue. The cuts were correct. The problem was in the syncing between BCL and the optimizer. I incorrectly invoked problem.sync(XPRB.XPRS_SOL) instead of problem.sync(XPRB.XPRS_SOLMIP). This manual syncing is very error prone. It would perhaps be slightly more obvious if XPRB.XPRS_SOL would be renamed to XPRB.XPRS_LPSOL