[rules-users] Strange MVEL error

[Edson Tirelli]

        Drools explicitly disables control statements in MVEL consequences,
at it is usually not a good sign. I.e., you should probably encapsulate that
check you are doing in a LHS condition (even if you have to wrap it up in an
eval()), so that the rule will not be activated and fired when it shouldn't.

        Edson

2009/11/3 Shah, Malay <Malay.Shah at morganstanley.com>

>  Hi All,
>
> I am trying to compile a drool rule using MVEL dialect and getting the
> following weird error.
>
>
> Unable to determine the used declarations.
>
> unbalanced braces (near code: << ... core1_entityOID); ...>>) (position:
> 33) : [Rule name=Legacy ETSDB Rule, agendaGroup=MAIN, salience=0,
> no-loop=false]
> *
>
> org.mvel.ParseException
> *: unbalanced braces (near code: << ... core1_entityOID); ...>>)
> (position: 33)Unable to build expression for 'consequence'
>
> The code I am trying to compile is:
>
> package S_124
> import com.ms.ieddata.dataQuality.violation.Violation;
> import com.ms.ieddata.etsdb.model.EtsExecution_core;
> import com.ms.ieddata.etsdb.model.EtsExecutionOrder_core;
> global java.util.HashSet violations;
> global java.util.HashSet violationKeys;
>
> dialect "mvel"
>
> rule "Legacy ETSDB Rule"
>
> when
> EtsExecution_core1:EtsExecution_core(crossInd == "1" , lastCapacity != "3"
> , lastDestinationID not in ("EUREX","IDEM","MEFF","LIFFE"))
> EtsExecutionOrder_core1:EtsExecutionOrder_core(entityOID ==
> EtsExecution_core1.parentOID , exDestination in ("I","L") ,
> swapComponentType != "swaps" , orderCapacity not in
> ("D","R","X","L","E","T","C","O","P","S"),EtsExecutionOrder_core1_entityOID:entityOID,EtsExecutionOrder_core1_application:application,EtsExecutionOrder_core1_entityVID:entityVID)
>
> then
>
> String key="S-124_EtsExecution_core" + "_entityVID_" +
> "EtsExecutionOrder_core1_entityVID" + "_application_" +
> "EtsExecutionOrder_core1_application" + "_entityOID_" +
> "EtsExecutionOrder_core1_entityOID";
>
> vPresent = violationKeys.contains(key);
>
> if (!vPresent)
> {
>      violation = new Violation();
>      violation.putRuleActionAttribute("ruleId","S-124");
>      violation.putRuleActionAttribute("ruleName","Legacy ETSDB Rule");
>      violation.putRuleActionAttribute("legacyRuleType","1");
>      violation.putRuleActionAttribute("entityName","EtsExecution_core");
>      violation.putRuleActionAttribute("fieldName","Field");
>
>  violation.putRuleActionAttribute("entityVID",EtsExecutionOrder_core1_entityVID);
>
>  violation.putRuleActionAttribute("application",EtsExecutionOrder_core1_application);
>
>  violation.putRuleActionAttribute("entityOID",EtsExecutionOrder_core1_entityOID);
> }
>
> end
>
> The code works fine when I use java dialect. Also, if I remove the if
> statement from consequence, the code get compiled in mvel and java dialects.
> Am I missing something obvious here? I am using drools 4.0.1.
>
> Thanks
>
> Malay Shah
> Morgan Stanley | IDEAS Practice Areas
> 750 Seventh Avenue, 6th Floor | New York, NY  10019
> Phone: +1 212 762-4495
> Malay.Shah at morganstanley.com
>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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