[GridSim-users] i want to solve this error so that i can proceed to store the output i recieved

[rashmita p. <ras...@gm...>]

Hi,



We are trying to simulate the TLBO algorithm using GridSim version 5.0. We
have created the following scenario:



School  - > Classrooms    -> Teacher - > Students [ Each student has a
machine and instance of GridSim ] -> Task is assigned to the student.
During execution

1              ->            5              ->        5         -> 20 /
teacher



We observe that post completion of the tasks of each GridSim node. We get
the following error as seen below.



eduni.simjava.Sim_exception: Sim_system: Attempt to send to a null entity
detected.

                at eduni.simjava.Sim_system.process_event(*
Sim_system.java:751*)

                at eduni.simjava.Sim_system.run_tick(*Sim_system.java:549*)

                at eduni.simjava.Sim_system.run(*Sim_system.java:1843*)

                at gridsim.GridSim.startGridSimulation(*GridSim.java:518*)

                at rashmita.thesis.TLBSchoolSimulator.main(*
TLBSchoolSimulator.java:142*)

*java.lang.NullPointerException*: GridSim.startGridSimulation() : Error -
you haven't initialized GridSim.

                at gridsim.GridSim.startGridSimulation(*GridSim.java:523*)

                at rashmita.thesis.TLBSchoolSimulator.main(*
TLBSchoolSimulator.java:142*)



Would you please be able to help us with this error ?


*Note:* We have called GridSim.init(1, Calendar.getInstance(), false);
before start of the execution of the tasks.
-- 
with regards...
*Rashmita pradhan.*