[rules-users] ClassCastException when comparing date type with literal

[FrankVhh]

Let me rephrase my question:

As date is an attribute of message, why don't you use:

               $msg : Message( date > "...")

Constraining an attribute of Message in the Order pattern seems a weird
thing to do.



Zeke-3 wrote
> 
> It seems not work.
> When I try
> *$msg : Message($date : date)
> Order ( $date > "Mar-01-2012" )*
> I meet error "Unable to create Field Extractor for '$date' of
> '[ClassObjectType class=org.drools.examples.HelloWorldExample$Second]' in
> rule 'default' : [Rule name=default, agendaGroup=MAIN, salience=0,
> no-loop=false]"
> 
> When I try
> *$msg : Message($date : date)
> eval ( $date > "Mar-01-2012" )*
> If the dialect is "java", I meet error "Rule Compilation error : [Rule
> name=default, agendaGroup=MAIN, salience=0, no-loop=false]
>     org/drools/examples/test/Rule_default_0.java (8:354) : The operator >
> is undefined for the argument type(s) Date, String"
> If the dialect is "mvel", I meet the same ClassCastException.
> 
> On 29 March 2012 22:28, FrankVhh <frank.vanhoenshoven@> wrote:
> 
>> This may sound a bit rude, but... why would you want to do such a thing?
>>
>> If there is a constraint on the message, then why not put that constraint
>> in
>> the message structure?
>>
>> Btw, I think it would work by using eval($date < "...") but see no use
>> for
>> it either.
>>
>>
>> Joe Zendle wrote
>> >
>> > did you try:
>> >
>> >  *$msg : Message($date : date)
>> > Order ( $date > "Mar-01-2012" )*
>> >
>> >
>> >
>> > 2012/3/29 Zeke &lt;xanadu860122@&gt;
>> >
>> >> Hi, guys:
>> >>   I meet a strange issue and need your help again... I am using Drools
>> >> 4.0.7.
>> >>   When my rule condition is as *Message( date > "Mar-01-2012" )*,
>> >> everything is OK. But if I change it to be as below:
>> >>   *$msg : Message()
>> >>   Order ( $msg.date > "Mar-01-2012" )*
>> >>   I will meet "java.lang.String cannot be cast to java.util.Date"
>> >> ClassCastException. "Order" is another fact. I attach the exception
>> call
>> >> stack. Please check it. It looks like a bug to me. Do we fix it in
>> later
>> >> release? If so, can you tell me which release contains the fix?
>> Thanks!
>> >>
>> >> _______________________________________________
>> >> rules-users mailing list
>> >> rules-users at .jboss
>> >> https://lists.jboss.org/mailman/listinfo/rules-users
>> >>
>> >>
>> >
>> > _______________________________________________
>> > rules-users mailing list
>> > rules-users at .jboss
>> > https://lists.jboss.org/mailman/listinfo/rules-users
>> >
>>
>>
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> 
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