Use salience or some other order to control the facts. But I think the key point to
remember is that Drools isn't stable, given the same set of rules and the same set of
input in the same order there is no guarantee that the rules will execute in the same
order unless there is something in the rules which forces them to do so. 99.9% of the time
the version you run will produce the same ordered output but perhaps 0.1% of the time it
could occur in a different order.
This can lead to some nasty intermittent bugs if rules aren't written correctly and
make implicit assumptions about the order they run.
My suspicion is this is due to some hash map/set buried deep in the code somewhere
controlling the order of equal priority activations, but I've never managed to work
out where this is (if my theory is even correct). It would be nice if it were changed to a
version that produces a consistent ordering every time (given the exact same set of
inputs).
Thomas
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-
bounces(a)lists.jboss.org] On Behalf Of Veera
Sent: 09 February 2012 06:25
To: rules-users(a)lists.jboss.org
Subject: [rules-users] Drools Debugging
Hi All,
I have one doubt that is : When i compiling a sample HelloWorld Drools
program it is printing output like :
Hello World
Goodbye cruel world
and i added a simple rule like :
rule "test"
when
eval(true)
then
System.out.println( "Hello!!!" ); end
When i compile the output is :
Hello!!!
Hello World
Goodbye cruel world
But when i debug it is showing output like:
Hello World
Goodbye cruel world
Hello!!!
Can anybody help me how to get the same output when i debug also...
Regards,
Veera
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View this message in context:
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Debugging-tp3728574p3728574.html
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