[rules-users] Multiple Object referencing error

[Swindells, Thomas]

You've still missed out the file which actually contains the main method which is where the exception is being thrown from...



> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] On Behalf Of Fnu Mahalakshmi
> Sent: 08 June 2010 15:13
> To: 'rules-users at lists.jboss.org'
> Subject: Re: [rules-users] Multiple Object referencing error
>
> Hi,
> Sorry about not posting the code. My mistake.
>
> Classes :
>
> public class Room {
>     private String name
>     private int number;
>     // getter and setter methods here
> }
> public classs Sprinkler {
>     private Room room;
>     private boolean on;
>     // getter and setter methods here
> }
> public class Fire {
>     private Room room;
>     // getter and setter methods here
> }
>
>
> I load 2 input files: 1. with data of fire and Room { f1, r1;f2, r2}
>
>                      2. with data of sprinkler and Room {"n/a",r1,"n/a",r3}
>
>
>
> I am writing rule " if fire exists in room start sprinkler" { so if f1 and r1
> in this case: I should get s1, r1 } But since no sprinkler in r2 , That data
> should not get outputted.
> I want my ouput file to look like:
> Name  Number
> Xyz   1
>
> # xyz is my room name and 1 is the room number : r1(xyz,1) . But I am unable
> to delete entries.Is there anyway I can do it?
>
> #only this should appears as the other room does not have a sprinkler.
>
> when
>
>     Fire($room : room)
>
>     $sprinkler : Sprinkler( room == $room, modified == false )
>
> Then
>
>     $sprinkler.setmodified(true);
>
>     modify( $sprinkler ) { setSprinkle( "s1" ) };
>
> end
>
>
> Error:
> I am getting the error at a place where I am trying to write back from my
> working memory to my output file.
> It is happening because the second rule to turn on the sprinkler does not work
> and as a result a null value is getting stored.
> Is it possible that there can exists 2 different Room() objects with the same
> room.name ??
> Because the room objects are getting stored from different files to the
> working memory ??
> Do you think it better to store room objects in a separate list??
> I store all information into a list and load that into the memory.
> Am I going wrong here?
>
> Please help.
>
> Thank you.
> -M
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