java - Branch And Bound not working in OptaPlanner -

i have directed acyclic graph, arcs entities , weights associated each arc planningvariables. use:

@valuerangeprovider(id = "bufferrange") public countablevaluerange<integer> getdelayrange() {     return valuerangefactory.createintvaluerange(1, 1000); } 

to assign values variables. also, i've come across issue: exhaustive search in optaplanner not work on simple example, solved setting variables int integer , checking null values in score calculation.

now problem solver seems not backtraking when assigning values. i've used print check values being attributed each arc. in beginning of solving process can see values being set different arcs. after time attributions solver stucks in assigning values same arc. checking prints see attributions going 1 1000 , starting again. since values domain tested 1 time, why solver not backtrack instead of assigning same values again?

i tested <nodeexplorationtype> options , created class use <entitysortermanner> same results.

thanks in advance.

i supose right geoffrey, deactivated log , let program run 48h , came answer. way logs printed mislead analysis. remark, if logger deactivated performance considerably superior.