Re: [rules-users] Please help - losing hair

I had same problem with 4M2 release. Please upgrade it to either 4.0.0 GA or 4M3 release. You can also find a sample example ShoppingExample.java and Shopping.drl, which is self-explanatory. However, I was not able to test few MVEL features like projections, which i think if added would make drools even more dynamic. Thanks, manjax23 Richard Hoberman wrote: > 1. I can't find any mention of dialects anywhere in the Drools 4 > manual. Am I missing something? > > 2. I've tried the following after finding a snippet in the archives for > this list: > > 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" > dialect "mvel" > when > Claim( submissionInfo == null ) > then > evaluation.getViolations().add("missing: date received"); > end > > > but it gives the following exception: > > java.lang.NullPointerException > at > > org.drools.rule.builder.RuleBuildContext.<init>(RuleBuildContext.java:115) > at > org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:350) > at > org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:233) > at > > org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:157) > at > > com.sadalbari.mvanamibia.model.UnregisteredClaimValidationTest.setupWorkingMemory(UnregisteredClaimValidationTest.java:29) > at > > com.sadalbari.mvanamibia.model.UnregisteredClaimValidationTest.testEmptyClaim(UnregisteredClaimValidationTest.java:42) > ... Removed 22 stack frames > > > Thanks > > Richard > > > Mark Proctor wrote: > >> 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+pr..., >>>> 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(a)lists.jboss.org >>>> https://lists.jboss.org/mailman/listinfo/rules-users >>>> >>>> >>>> >>>> >>> >>> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > >