[rules-users] The buss pass example of inference results in compilation errors, how to solve these?

ajklunder2 albert.jan.klunder at gmail.com
Wed Mar 20 06:31:45 EDT 2013 

Thanks Stephen,

This was very helpful!

Albert Jan

2013/3/20 Stephen Masters [via Drools] <
ml-node+s46999n4022923h69 at n3.nabble.com>

> There seem to be a couple of misunderstandings of what in inferred type is.
>
> Firstly, it's a fact type just like any other fact. You are inserting it
> into working memory in your rule. Therefore you need to declare it. I tend
> to use declared types for inferred facts. i.e.:
>
> declare IsBadDebtor
> debtor: com.invoicestore.domain.Debtor
> end
>
> Secondly, it does not need to extend anything. Obviously, you could create
> an IsBadDebtor class, which extends the Debtor class, but that's not
> required. Note in the above example that debtor is a property of the
> IsBadDebtor declared type.
>
> Steve
>
>
>
> On 20 Mar 2013, at 07:39, Bharadwaj N <[hidden email]<http://user/SendEmail.jtp?type=node&node=4022923&i=0>>
> wrote:
>
> Can you show me Debtor class ?
>
>
> On Wed, Mar 20, 2013 at 12:56 PM, ajklunder2 <[hidden email]<http://user/SendEmail.jtp?type=node&node=4022923&i=1>
> > wrote:
>
>> Thanks,
>>
>> Is that the solution? That seems odd to me because IsBadDebtor is an
>> inferred object and should have the class Debtor. When you have to declare
>> a class for every type of inferred object you are using that would be
>> strange. These classes would extend the class where they are inferred from
>> and would be totally empty: no own attributes, nor methods. They would only
>> be declared to solve this compilation issue.
>>
>>
>> It seems u have not imported the IsBadDebtor class in your drool file
>>>
>>
>>
>>> If it's inner class of Debtor then use as Debtor.IsBadDebtor.drools
>>> compiler unable to find IsBadDebtor
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Bharadwaj nakka.
>>>
>>>
>>> On Wed, Mar 20, 2013 at 12:14 PM, ajklunder2 <[hidden email]<http://user/SendEmail.jtp?type=node&node=4022913&i=0>
>>> > wrote:
>>>
>>>> Hi,
>>>>
>>>> In the Drools documentation is "the buss pass" example of how to use
>>>> inference.
>>>>
>>>> rule "Infer Adult"
>>>> when
>>>>   $p : Person( age >= 18 )
>>>> then
>>>>   insert( new IsAdult( $p ) )
>>>> end
>>>>
>>>> However, when I try this myself I get compilation errors on IsAdult and
>>>> a
>>>> missing ";" after the insert statement. (I am using the Drools plugin in
>>>> Eclipse)
>>>>
>>>> Here is an example of my own what has the same issue:
>>>>
>>>> //list any import classes here.
>>>> import com.example.vdc.VdcLandingPage;
>>>> import com.invoicestore.domain.Debtor;
>>>>
>>>> //declare any global variables here
>>>> global VdcLandingPage UI;
>>>>
>>>>
>>>> rule "Infer bad debtor"
>>>>
>>>> when
>>>>         $debtor : Debtor( isBadDebtor() == true )
>>>> then
>>>>         insert( new IsBadDebtor( $debtor ) );
>>>> end
>>>>
>>>>
>>>> BuildError: Unable to Analyse Expression drools.insert( new IsBadDebtor(
>>>> $debtor ) );:
>>>> [Error: Failed to compileShared: 1 compilation error(s):
>>>>  - (1,16) could not resolve class: IsBadDebtor]
>>>> [Near : {... drools.insert( new IsBadDebtor( $debtor ) ); ....}]
>>>>                             ^
>>>> [Line: 23, Column: 0]
>>>>
>>>> I have studied the Drools documentation and cannot find anything what
>>>> might
>>>> lead to a solution. I have tried to set the dialect to "mvel" but that
>>>> is
>>>> not solving the problem.
>>>>
>>>> Any suggestions how to solve this?
>>>>
>>>>
>>>>
>>>>
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>>>
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