Hello every one ,I study the drool.plannar recently and both tried the planner 5.5 and planner 6.0(optaplanner) to solve my problem. I found something puzzles: 1 Is there any big difference between planner 5.5 and planner 6.0. I run the same process in both planner 5.5 and planner 6.0 with the same config, I find planner 5.5 gives the solution with 19hard broken while planner 6.0 give the solution with 502hard broken !!!!! I am not sure why it happens. 2 When I open the demo in optaplanner in eclipse, I find every "scoreHolder.addConstraintMatch(....);" have the error like this:The method addConstraintMatch(kcontext，..) in the type SimpleScoreHolder is not applicable for the arguments (RuleContext, int)", can anybody help me. 3 The problem has a solution which breaks no rules while both planner 5.5 and 6.0 never found it using the tabu search and hill climb search. I wonder is it right or is there any other global search method in planner.