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

[Ryo Murai (JIRA)]

Ryo Murai created DROOLS-1724:
---------------------------------

             Summary: 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: Edson Tirelli


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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