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 > > >

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

These days trunk snapshot is the best place, as it has all the latest fixes, this is what will make up 4.0.1 when its releases. http://cruisecontrol.jboss.com/cc/artifacts/jboss-rules Mark Manjax23 wrote: > 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 >> >> >> > > ------------------------------------------------------------------------ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users