MVEL2-2.1.0.drools4.jar (packaged with Drools 5.3 final)

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Monday, February 13, 2012 5:48 PM
To: Rules Users List
Subject: Re: [rules-users] Using Character typed properties in Drool 5.3

   Which version of MVEL are you using? It looks like a regression. I will ping Mario to take a look.

   Edson

On Mon, Feb 13, 2012 at 6:45 PM, Welsh, Armand <AWelsh@statestreet.com> wrote:

Correction:

Even using Character.valueOf('Y') does not work anymore in Drools 5.3.  The validate works, but the compile steps fails because Drools is treating 'Y' as a String.  However, in Drools 5.2 and prior, 'Y' was properly casted to a Character when the property it was being compared to was a property of type Character.

If anyone has any insight on where the documentation address this change in behavior, I would appreciate some guidance.  I am trying to re-standardize how our rules are coded for evaluating Character typed properties.

Armand

-----Original Message-----
From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Welsh, Armand
Sent: Monday, February 13, 2012 3:16 PM
To: Rules Users List
Subject: [rules-users] Using Character typed properties in Drool 5.3

Community,

In drools 5.2 I had the following LHS"

when
       BloombergColumn (columnName == "CRNCY", $cur : stringValue != null)
       Country (currency == $cur, emergingMkt == 'Y' || countryCode in ("BH","HR","CZ","EE","HK","HU","IL","KR","KW","MO","OM","QA","SA","SG","SK","SI","TT"))


I am switching to Drool 5.3, and Drools Guvnor reports the following error upon validate (or compile):

       [bum_code_value.currency 01] Unable to Analyse Expression emergingMkt == 'Y' || countryCode == "BH" || countryCode == "HR" || countryCode == "CZ" || countryCode == "EE" || countryCode == "HK" || countryCode == "HU" || countryCode == "IL" || countryCode == "KR" || countryCode == "KW" || countryCode == "MO" || countryCode == "OM" || countryCode == "QA" || countryCode == "SA" || countryCode == "SG" || countryCode == "SK" || countryCode == "SI" || countryCode == "TT": [Error: Comparison operation requires compatible types. Found class java.lang.Character and class java.lang.String] [Near : {... == "SK" || countryCode == "SI" || countryCode == "TT" ....}] ^ [Line: 7, Column: 28]

Looking at the emergingMkt in my data model, I see that it is defined as a Character.  If I change my LHS to:

       BloombergColumn (columnName == "CRNCY", $cur : stringValue != null)
       Country (currency == $cur, emergingMkt == Character.valueOf('Y') || countryCode in ("BH","HR","CZ","EE","HK","HU","IL","KR","KW","MO","OM","QA","SA","SG","SK","SI","TT"))


Then the validate passes.

Was this change in behavior intentional?  I don't see a reference to this change in the Drools 5.3 documentation, and this makes for a harder to read rule for our Drools analysts.

Thanks in advance,
Armand

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--
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com