Re: [rules-users] NullPointerException when calling ScoreDirector.beforeEntityAdded with new Vehicle
Thanks for reporting.
That's a terminology bug.
The Vehicle isn't both an entity and not an entity...
A) It's an entity because it has @PlanningVariable and a shadow variable.
B) But it's also not an entity because it doesn't have any genuine
variables,
and therefore ScoreDirector throws that NPE... (which should be a better
error message too).
I 'll fix this for 6.1, probably by discarding B).
Could you file a jira for this?
https://issues.jboss.org/browse/PLANNER
Workaround for 6.0.1:
Presuming you're doing this in a ProblemFactChange,
call scoreDirector.beforeProblemFactRemoved() instead of
beforeEntityRemoved()
=> Treat it as a problem fact for that... but treat is as an entity
for everything else.
hth
On 06-05-14 16:17, Hagai wrote:
Using OptaPlanner 6.0.1.Final with problem like vehiclerouting.
In vehiclerouting the Vehicle and Customer are both planning entities. They
both implements the Standstill interface that is annotated with
@PlanningEntity and their collections are annotated with
@PlanningEntityCollectionProperty on the solution class.
Flowing the code of VehicleRoutingPanel.insertLocationAndCustomer to insert
a new Vehicle to the solution, my code is failing when the new Vehicle is
reported to the score director:
scoreDirector.beforeEntityAdded(newVehicle);
The exception is NullPointerException at
org.optaplanner.core.impl.domain.variable.listener.PlanningVariableListenerSupport.beforeEntityAdded(PlanningVariableListenerSupport.java:54)
It looks like the PlanningVariableListenerSupport.entityVariableListenerMap
does not have item for the Vehicle entity, there is only one item for the
Customer entity in this map.
I get the same problem when calling ScoreDirector.beforeEntityRemoved to
remove a Vehicle.
Is this a bug or do I need to handle Vehicle entities differently?
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