[rules-users] ConsequenceException when using modify

[Wolfgang Laun]

What is the initial value of variable1 in its MyObject object?

Is setVariable1() a regular setter just storing the parameter into the field?

What is defaultValue, where does it come from?

-W

On 16/02/2012, Vakimshaar <jean.logeart at gmail.com> wrote:
> Hi everybody,
>
> I have been struggling with a problem for a few hours now.
>
> Basically, what I am trying to do is set a default value to variable1 in a
> first rule. Then executes an other rule that checks the value of variable1
> and set variable2 to a specific value under some conditions. Right now, my
> rules go like this :
>
> rule "First rule: default"
> 	salience 10
> 	lock-on-active true
> 	when
> 		$myObject : MyObject()
> 	then
> 		modify($myObject) {
> 			setVariable1(defaultValue);
> 		}
> end
>
> rule "Second rule"
> 	salience 0
> 	lock-on-active false
> 	when
> 		$myObject : MyObject(variable1 == defaultValue)
> 	then
> 		$myObject.setVariable2(value2);
> end
>
> When those rules are executed, an exception is thrown :
> org.drools.runtime.rule.ConsequenceException: rule: First rule: default
> ...
> Caused by: java.lang.NullPointerException
>
> When I remove the "modify" in the first rule, the exception is not thrown
> but obviously the second rule is not properly executed ...
>
> What is the problem ? What am I doing wrong ?
>
> Thanks for your help!
> Vak'
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/ConsequenceException-when-using-modify-tp3750604p3750604.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>