java - Variablelistener corruption with anchorshadowedvariable in optaplanner -

i trying solve planning problem time window vehicule routing problem.

so looking solution containing list of tasks. tasks can assigneed 1 of 2 workers.

my task class looks (i didn't cut/paste getters , setters here) :

@planningentity(difficultycomparatorclass = taskdifficultycomparator.class) public class task implements location {     private string location;     private localtime arrivaltime;     private location previouslocation;     private task nexttask;     private startlocal startlocal;       private duration taskduration = duration.ofminutes(20);     private localtime readytime;     private localtime duetime;      @planningvariable(valuerangeproviderrefs = {"tasks", "startlocal"},             graphtype = planningvariablegraphtype.chained)     public location getpreviouslocation() {         return previouslocation;     }     public void setpreviouslocation(location previouslocation) {         this.previouslocation = previouslocation;     }      @override     public string {return location;}      @override     public void setlocation(string location) {this.location = location;}      public int gettimetogoto(location location) {         ....     }      @anchorshadowvariable(sourcevariablename = "previouslocation")     public startlocal getstartlocal() {         return startlocal;     }     public void setstartlocal(startlocal startlocal) {         this.startlocal = startlocal;     }      @customshadowvariable(variablelistenerclass = arrivaltimevariablelistener.class,             sources = {@customshadowvariable.source(variablename = "previouslocation")})     public localtime getarrivaltime() {         return arrivaltime;     }     public void setarrivaltime(localtime arrivaltime) {         this.arrivaltime = arrivaltime;     } } 

and variable listener class :

public class arrivaltimevariablelistener implements variablelistener<task> {     @override     public void beforeentityadded(scoredirector scoredirector, task task) {}      @override     public void afterentityadded(scoredirector scoredirector, task task) {         updatearrivaltime(scoredirector, task);     }      @override     public void beforevariablechanged(scoredirector scoredirector, task task) {        }      @override     public void aftervariablechanged(scoredirector scoredirector, task task) {         updatearrivaltime(scoredirector, task);     }      @override     public void beforeentityremoved(scoredirector scoredirector, task task) {        }      @override     public void afterentityremoved(scoredirector scoredirector, task task) {        }      private void updatearrivaltime(scoredirector scoredirector, task task){         localtime arrivaltimeinthislocation = calculatearrivaltime(task);         task shadowtask = task;         while (shadowtask != null) {             scoredirector.beforevariablechanged(shadowtask, "arrivaltime");             shadowtask.setarrivaltime(arrivaltimeinthislocation);             scoredirector.aftervariablechanged(shadowtask, "arrivaltime");             shadowtask = shadowtask.getnexttask();             if(shadowtask!=null)arrivaltimeinthislocation = calculatearrivaltime(shadowtask);         }     }      @visiblefortesting     static public localtime calculatearrivaltime(task task){         localtime whenarriveatpreviouslocation = task.getpreviouslocation().getarrivaltime();         int secondstogo = task.gettimetogoto(task.getpreviouslocation());         long secondstocompletelasttask = 0;         if(task.getpreviouslocation() instanceof task){             secondstocompletelasttask = ((task) task.getpreviouslocation()).gettaskduration().getseconds();         }         localtime whenarriveinthislocationasap = whenarriveatpreviouslocation.                 plusseconds(secondstocompletelasttask).                 plusseconds(secondstogo);          if(whenarriveinthislocationasap.isafter(task.getreadytime())){                             return whenarriveinthislocationasap;         }         return task.getreadytime();     } } 

when try solve problem have following error :

variablelistener corruption: entity (task s shadow variable (task.arrivaltime)'s corrupted value (09:32) changed uncorrupted value (09:33) after variablelisteners triggered without changes genuine variables. variablelistener class shadow variable (task.arrivaltime) forgot update when 1 of sources changed after completedaction (initial score calculated).

i know issue duplicate of this one. read (very very) carrefully answer of sof question, , can't understand doing wrong.

i understood, role of variable listener in use case update "arrivaltime" of tasks following tasks change. isn't ?

add updatearrivaltime() method beforevaluechanged().

my guess you're on full_assert.