[jboss-jira] [JBoss JIRA] (DROOLS-1724) DRL compilation error on a generic type property

[Mario Fusco (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-1724?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco updated DROOLS-1724:
--------------------------------
    Sprint: 2017 Week 36-37


> DRL compilation error on a generic type property
> ------------------------------------------------
>
>                 Key: DROOLS-1724
>                 URL: https://issues.jboss.org/browse/DROOLS-1724
>             Project: Drools
>          Issue Type: Bug
>    Affects Versions: 6.5.0.Final
>         Environment: drools 6.5.0.Final / java 1.8.0_131
>            Reporter: Ryo Murai
>            Assignee: Mario Fusco
>             Fix For: 7.3.1.Final
>
>
> I got a DRL compilation error on accessing through a generic type property. Minimized object definition is below.
> {code:borderStyle=solid}
> public interface OrderLine<T extends Product> {
>     T getProduct();
> }
> public interface Product {
>     String getId();
>     String getCategory();
> }
> // and I have concrete classes, ex. Book, BookOrderLine<Book>, DVD, DVDOrderLine<DVD>, ... etc
> {code}
> DRL(snippet) is here
> {code:borderStyle=solid}
> when
>     $orderLine: OrderLine()
>     // compilation failed
>     Product(
>         id == $orderLine.product.id || category == $orderLine.product.category
>     ) from discountProducts
> {code}
> This causes below exception.
> {panel}
> java.lang.RuntimeException: [Message [id=1, kieBase=defaultKieBase, level=ERROR, path=rules/checkorder-not-compiled.drl, line=15, column=0   text=Unable to Analyse Expression id == $orderLine.product.id || category == $orderLine.product.category:
> [Error: unable to resolve method using strict-mode: java.lang.Object.category()]
> [Near : {... Line.product.id || category == $orderLine.product.category ....}]
>                                                                ^
> [Line: 15, Column: 2]]]
> {panel}
> This is weird because it won't occur when the restriction has single condition like below. Drools could analyze this expression.
> {code:borderStyle=solid}
> when
>     $orderLine: OrderLine()
>     // this is compiled, even if `Product(id == $orderLine.product.id)`
>     Product(
>         category == $orderLine.product.category
>     ) from discountProducts
> {code}



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