NotFromMismatchedToken

    When using the conditional element NOT together with FROM e.g.

     

    rule "rulename"
    when
        $t : Tariffs( )
        not TariffItemList ( ) from $t.getTariffItemLists()
    then
        //Do something
    end
    

     

    The Tariffs object contains a list of TariffItem objects.

     

    You might get a rule compilation error similar to:

    org.drools.rule.InvalidRulePackage: 9830: unknown:98:30 mismatched token: [90327422745from529830|@903,2742:2745='from',<52>,98:30]; expecting type THEN

     

    The error indicates the location of the problem which in this case is character 30 on line 98 - this is handy when you have a large number of rules in a single DRL file and the rule that caused the failure is not reported.

     

    The compiler is reporting that your syntax is incorrect.

     

    The correct syntax is:

     

    rule "rulename"
    when
        $t : Tariffs( )
        not ( TariffItemList ( ) from $t.getTariffItemLists() )
    then
        //Do something
    end