Re: [GridSim-developers] [GridSim-users] Extending GridSim Reg-JR

[Marcos D. de A. <ma...@cs...>]

Dear Jeyarani,

please note that as the entities in a simulation are threads,  
sometimes you get an error message that is not very related to what  
is actually causing the problem. So, it is difficult to say what  
might be causing the problem in your case. Please check if in the  
policy you implemented you are setting the status of the gridlets  
properly before returning them to the user entity. Also, check if the  
user entity waits for the return of the gridlets before shutting the  
simulation down.

Regards,

Marcos


On 10/02/2009, at 4:09 AM, Jeyarani Rajarathinam wrote:

> Hi Friends,
>      I am using GridSim4.0 and I have  created new internal policy  
> instead of FCFS. I get the following error. Please help me to  
> correct the problem
>
> JR
> I have submitted 4 gridlets  and the fourth gridlet is small  
> compared to rest.
>
> Sim_system: No more future events
> Gathering simulation data.
> GridResource_0: Warning - Gridlet #3 owned by User_0 is already  
> completed/finish
> ed.Exception in thread "Thread-9"
> java.lang.NullPointerExceptionTherefore, it is not being executed  
> again
>
>         at Example8.body(Example8.java:107)
>
>         at eduni.simjava.Sim_entity.run(Sim_entity.java:603)
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Marcos Dias de Assuncao
Grid Computing and Distributed Systems (GRIDS) Laboratory
Department of Computer Science and Software Engineering
The University of Melbourne, Australia
Email: ma...@cs...

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