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

[Stephen Masters]

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 <bharadwaj2012 at gmail.com> wrote:

> Can you show me Debtor class ?
> 
> 
> On Wed, Mar 20, 2013 at 12:56 PM, ajklunder2 <albert.jan.klunder at gmail.com> 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]> 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?
> 
> 
> 
> 
> --
> View this message in context: http://drools.46999.n3.nabble.com/The-buss-pass-example-of-inference-results-in-compilation-errors-how-to-solve-these-tp4022912.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> [hidden email]
> https://lists.jboss.org/mailman/listinfo/rules-users
> 
> 
> _______________________________________________ 
> rules-users mailing list 
> [hidden email] 
> https://lists.jboss.org/mailman/listinfo/rules-users 
> 
> If you reply to this email, your message will be added to the discussion below:
> http://drools.46999.n3.nabble.com/The-buss-pass-example-of-inference-results-in-compilation-errors-how-to-solve-these-tp4022912p4022913.html
> To unsubscribe from The buss pass example of inference results in compilation errors, how to solve these?, click here.
> NAML
> 
> 
> View this message in context: Re: [rules-users] The buss pass example of inference results in compilation errors, how to solve these?
> 
> 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
> 
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20130320/ce8a6741/attachment.html