4:04 p.m.
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( $sprinkler ) { setSprinkle( "s1" ) };
end
But this gives me error:
Exception in thread "main" java.lang.NullPointerException
at java.io.Writer.write(Unknown Source)
at com.org.RulesTest.main(RulesTest.java:58)
From what I observed this rule is not getting fired at all.
I
want this rule to be fired on the data in my second input file.
The rules for my first input file get executed properly.
Can any1 tell me where I am going wrong??
Is there any way in which we can use the modified data { after rules are fired on the
first input data and it is modified}to fire another set of rules on the same input
depending on the next input file???
Thank you.
-M
</pre>
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4:12 p.m.
This has nothing to do with Drools. It looks like you are giving Writer bad
input perhaps??
Exception in thread "main" *java.lang.NullPointerException*
at java.io.Writer.write(Unknown Source)
at com.org.RulesTest.main(*RulesTest.java:58*)
2010/6/7 Fnu Mahalakshmi <FMahalakshmi(a)nyx.com>
Hi,
I am trying out this example from the book :
public class Room {
private String name
// getter and setter methods here
}
public classs Sprinkler {
private Room room;
private boolean on;
// getter and setter methods here
}
public class Fire {
private Room room;
// getter and setter methods here
}
I load 2 input files: 1. with data of fire and Room { f1, r1;f2, r2}
2. with data of sprinkler and Room { “ “, r1; “
“ , r2}
I am writing rule “ if fire exists in room start sprinkler” { so if f1 and
r1 in this case: I should get s1, r1 }
when
Fire($room : room)
$sprinkler : Sprinkler( room == $room, modified == false )
Then
$sprinkler.setmodified(true);
modify( $sprinkler ) { setSprinkle( “s1” ) };
end
But this gives me error:
Exception in thread "main" *java.lang.NullPointerException*
at java.io.Writer.write(Unknown Source)
at com.org.RulesTest.main(*RulesTest.java:58*)
From what I observed this rule is not getting fired at all.
I want this rule to be fired on the data in my second input file.
The rules for my first input file get executed properly.
Can any1 tell me where I am going wrong??
Is there any way in which we can use the modified data { after rules are
fired on the first input data and it is modified}to fire another set of
rules on the same input depending on the next input file???
Thank you.
-M
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7:25 a.m.
Look at the line 58 of RulesTest class and you will find the problem. Try to
always analyse the stacktrace if there are no drools classes involved, then
it is not a Drools error. And remember, the debugger is your friend ;)
Best,
2010/6/7 David Sinclair <dsinclair(a)chariotsolutions.com>
This has nothing to do with Drools. It looks like you are giving
Writer bad
input perhaps??
Exception in thread "main" *java.lang.NullPointerException*
at java.io.Writer.write(Unknown Source)
at com.org.RulesTest.main(*RulesTest.java:58*)
2010/6/7 Fnu Mahalakshmi <FMahalakshmi(a)nyx.com>
> Hi,
>
>
>
> I am trying out this example from the book :
>
> public class Room {
>
> private String name
>
> // getter and setter methods here
>
> }
>
> public classs Sprinkler {
>
> private Room room;
>
> private boolean on;
>
> // getter and setter methods here
>
> }
>
> public class Fire {
>
> private Room room;
>
> // getter and setter methods here
>
> }
>
>
>
> I load 2 input files: 1. with data of fire and Room { f1, r1;f2, r2}
>
> 2. with data of sprinkler and Room { “ “, r1; “
> “ , r2}
>
>
>
> I am writing rule “ if fire exists in room start sprinkler” { so if f1 and
> r1 in this case: I should get s1, r1 }
>
> when
>
> Fire($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
>
> ------------------------------
>
> *Please consider the environment before printing this email.*
>
> *Visit our website at http://www.nyse.com
> *****************************************************************************
>
> Note: The information contained in this message and any attachment to it
> is privileged, confidential and protected from disclosure. If the reader of
> this message is not the intended recipient, or an employee or agent
> responsible for delivering this message to the intended recipient, you are
> hereby notified that any dissemination, distribution or copying of this
> communication is strictly prohibited. If you have received this
> communication in error, please notify the sender immediately by replying to
> the message, and please delete it from your system. Thank you. NYSE
> Euronext. *
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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Esteban Aliverti
5288
days inactive
5289
days old
2 comments
3 participants
participants (3)
-
David Sinclair -
Esteban Aliverti -
Fnu Mahalakshmi