[rules-users] Please help - losing hair

[Mark Proctor]

in theory for nested accessors it should switch to the MVEL dialect 
automatically. You only need to specify the MVEL dialect explicitely for 
eval, return value and consequences.

Mark
Manjax23 wrote:
> I think you should use dialect "mvel" when accessing the nested accessors.
> and I had some trouble with "mvel" dialect in 4M2 release.
>
> Please let me know if it works for you..
>
> Thanks,
> Manjax23
>
>
> Richard Hoberman wrote:
>   
>> I'm using Drools 4 (M2), which is supposed to support nested accessors*
>>
>> This works: when Claim( submissionInfo == null), but not this: when
>> Claim( submissionInfo.date == null)
>>
>> Rule file, SubmissionInfo.java and exception are below.
>>
>> What am I missing?
>>
>> Richard
>>
>>
>>
>>
>> * See
>> http://article.gmane.org/gmane.comp.java.drools.user/8079/match=nested+properties,
>> which states "Support to nested accessors, property navigation and
>> simplified collection, arrays and maps syntax"
>>
>> Rule File
>>
>> ---------------------------------------------------------------------------------------
>> package mvanamibia.claim;
>>
>> import java.lang.Object;
>> import java.lang.String;
>> import java.lang.Double;
>> import java.util.Date;
>> import java.util.List;
>> import java.util.ArrayList;
>> import com.sadalbari.mvanamibia.beans.Claim;
>> import com.sadalbari.mvanamibia.beans.Mandate;
>> import com.sadalbari.mvanamibia.beans.SubmissionInfo;
>> import com.sadalbari.mvanamibia.inspector.ClaimEvaluation;
>>
>> global ClaimEvaluation evaluation;
>>
>> rule "hasDateReceived"
>>
>>     when
>>         Claim( submissionInfo.date == null )
>>     then
>>         evaluation.getFailures().add("missing: date received");
>> end
>>
>> -----------------------------------------------------------------------------------
>>
>> Exception
>> -----------------------------------------------------------------------------------
>> org.drools.rule.InvalidRulePackage: [19,23]: unknown:19:23 mismatched
>> token: [@137,471:471='.',<69>,19:23]; expecting type RIGHT_PAREN
>>     at org.drools.rule.Package.checkValidity(Package.java:368)
>>     at
>> org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:250)
>>     at
>> com.sadalbari.mvanamibia.model.UnregisteredClaimValidationTest.setupWorkingMemory(UnregisteredClaimValidationTest.java:33)
>>     at
>> com.sadalbari.mvanamibia.model.UnregisteredClaimValidationTest.testMandateClaim(UnregisteredClaimValidationTest.java:56)
>> ... Removed 22 stack frames
>> FAILED: testEmptyClaim
>> org.drools.rule.InvalidRulePackage: [19,23]: unknown:19:23 mismatched
>> token: [@137,471:471='.',<69>,19:23]; expecting type RIGHT_PAREN
>>     at org.drools.rule.Package.checkValidity(Package.java:368)
>>     at
>> org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:250)
>>     at
>> com.sadalbari.mvanamibia.model.UnregisteredClaimValidationTest.setupWorkingMemory(UnregisteredClaimValidationTest.java:33)
>>     at
>> com.sadalbari.mvanamibia.model.UnregisteredClaimValidationTest.testEmptyClaim(UnregisteredClaimValidationTest.java:42)
>> ... Removed 22 stack frames
>>
>>
>> ------------------------------------------------------
>> SubmissionInfo (relevant bits)
>>
>> public class SubmissionInfo implements Serializable {
>>
>>     private Date date;
>>
>>     public Date getDate() {
>>         return date;
>>     }
>>
>>     public void setDate(Date date) {
>>         this.date = date;
>>     }
>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>>     
>
>   

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