[rules-users] complex rule conditions

[sweng]

Hi,

I want to use some "complex" conditions on the lhs of a rule.
Following the example in the drools-expert docu:

Person( girlAge : age, sex = "F" )
Person( eval( age == girlAge + 2 ), sex = 'M' )

I have try the following rule:

rule "detect stop of cars"
    when
        p1:PositionReportEvent( $t1:time) 
        p2:PositionReportEvent( eval(time == $t1 + 30))
    then
        System.out.println("do something");
end

but it is never triggered. 
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