Hi,
I am trying out this example from the book :
public class Room {
private String name
// 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 { " ", r1; " " ,
r2}
I am writing rule " if fire exists in room start sprinkler" { so if f1 and r1
in this case: I should get s1, r1 }
when
Fire($room : room)
$sprinkler : Sprinkler( room == $room, modified == false )
Then
$sprinkler.setmodified(true);
modify( $sprinkler ) { setSprinkle( "s1" ) };
end
But this gives me error:
Exception in thread "main" java.lang.NullPointerException
at java.io.Writer.write(Unknown Source)
at com.org.RulesTest.main(RulesTest.java:58)
>From what I observed this rule is not getting fired at all.
I want this rule to be fired on the data in my second input file.
The rules for my first input file get executed properly.
Can any1 tell me where I am going wrong??
Is there any way in which we can use the modified data { after rules are fired
on the first input data and it is modified}to fire another set of rules on the
same input depending on the next input file???
Thank you.
-M
</pre>
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