[jboss-jira] [JBoss JIRA] (JBRULES-3129) Regression: Evaluator '==' does not support 'null' any more

[Mario Fusco (Resolved) (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-3129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved JBRULES-3129.
----------------------------------

    Resolution: Rejected


Drools 5.2 is more strict when deriving type information. In particular all collection are now type-safe by default. It means that the items in the list are actually treated as java.lang.Objects that of course don't have a property named 'a'.
If necessary it is possible to relax this constraint by adding the annotation @typesafe(false) on the ListOfThree declaration.
                
> Regression: Evaluator '==' does not support 'null' any more
> -----------------------------------------------------------
>
>                 Key: JBRULES-3129
>                 URL: https://issues.jboss.org/browse/JBRULES-3129
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-compiler
>    Affects Versions: 5.2.0.Final
>            Reporter: Wolfgang Laun
>            Assignee: Mario Fusco
>             Fix For: 5.2.1.Final
>
>
> The DRL file given below causes these error messages (although it compiled and executed correctly in 5.1.1). 
> =============================================================
> Evaluator '==' does not support type 'null : [Rule name='rule1']
> [DialectError message='Unable to wire compiled classes, probably related to compilation failures:[Error: unable to resolve method using strict-mode: java.lang.Object.a()]
> [Near : {... list[0].a ....}]
>                      ^
> [Line: 1, Column: 9]']
> =============================================================
> import java.util.List
> declare Three
>   a : String
>   b : String
>   c : String
> end
> declare ListOfThree
>   list : List
>   clazz : Class
> end
> rule 'rule1'
> when
>     ListOfThree( list.size > 0 && list[0].a == null, $c: clazz );
> then
>     System.out.println( "rule1 " + $c.getSimpleName() );
> end

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