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Lazy cut callback in Java
In Java, how can one separate cuts in a lazy manner, i.e. only separate cuts at the integer nodes? Such an approach is common in for instance a standard TSP formulation where the subtour elimination ...
Cuts are expected to be added in the 'OPTNODE' callback (so XPRSoptNodeListener from Java). Regarding the use of this callback for the implementation of TSP subtour elimination constraints you may want to take a look at the example f5touroptcbrandom.mos that shows an implementation with Mosel (the use of the Optimizer callbacks follows the same logic as what one would employ in a Java program): within the implementation of the OPTNODE callback function the solver parameter MIPINFEAS is queried to decide whether to trigger cut generation.