[rules-users] Compilation errors with 5.3.0.CR1

Wolfgang Laun wolfgang.laun at gmail.com
Wed Oct 5 08:44:26 EDT 2011 

Write this like so:
   EmNumberRestriction(this == ($constr.getRestrictions[0]),...
-W

2011/10/5 Wacław Borowiec <wborowiec at proximetry.pl>
>
> Thanks for your answer Thomas. It showed that this construct works fine either way with 5.3.0.CR1, but it's other rule that causes the error:
>
> rule "restriction number paramId: 1, id: 0"
> when
>
>     $param : EmParamValue(id == 1, enabled == true)
>     $def : EmParamDefinition(this == $param.paramDefinitionId)
>     $cust : EmCustomParamDefinition(this == $param.customParamDef)
>     $constr: EmNumberConstraint(this == $cust.constraints)
>     $restr: EmNumberRestriction(this == $constr.restrictions[0], min <= $param.requiredValue, max >= $param.requiredValue)
> then
>     EmRulesUtils.logRuleExecution(kcontext);
>     result.addValidParam($param);
> end
>
> and DRL error:
>
> [DialectError message='Unable to wire compiled classes, probably related to compilation failures:sun.reflect.generics.reflectiveObjects.WildcardTypeImpl cannot be cast to java.lang.Class']
>
> It compiles successfully when I remove
>
> this == $constr.restrictions[0]
>
> part from last line of LHS. Again, it worked well in 5.1.1.
>
> On 10/05/2011 12:14 PM, Swindells, Thomas wrote:
>
> Why do you need the and in the rule?
> Have you tried
>
> rule "enabled paramId: 1, id: 0"
> salience 50
> when
>
>       def0: EmParamDefinition(paramName == "p2", listIndex == -1)
>       EmParamValue(paramDefinitionId == def0, requiredValue == 1)
>       $param : EmParamValue(id == 1, enabled == false)
>       not ParentDisabled(id == 1)
>  then
>       $param.setEnabled(true);
>       update($param);
>  end
>
> Thomas
>
> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] On Behalf Of Waclaw Borowiec
> Sent: 05 October 2011 10:55
> To: rules-users at lists.jboss.org
> Subject: [rules-users] Compilation errors with 5.3.0.CR1
>
> Hello
>
> I'm sending the message once again due to problems with code samples
> visibility in the previous one.
>
> I've got following rule:
>
> rule "enabled paramId: 1, id: 0"
> salience 50
> when
>      (def0: EmParamDefinition(paramName == "p2", listIndex == -1) and
> EmParamValue(paramDefinitionId == def0, requiredValue == 1))
>      $param : EmParamValue(id == 1, enabled == false)
>      not ParentDisabled(id == 1)
> then
>      $param.setEnabled(true);
>      update($param);
> end>
>
> It compiles fine under Drools 5.1.1, but after switching to 5.3.0.CR1 I get
> following exception:
>
> [Error: unexpected end of statement]
> [Near : {... def ....}]
>                  ^
> [Line: 1, Column: 4]
>      at
> org.mvel2.compiler.AbstractParser._captureBlock(AbstractParser.java:1470)
>      at
> org.mvel2.compiler.AbstractParser.captureCodeBlock(AbstractParser.java:14
> 46)
>      at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:421)
>      at
> org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:1
> 28)
>      at
> org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62
> )
>      at org.mvel2.MVEL.analysisCompile(MVEL.java:668)
>      at org.mvel2.MVEL.analysisCompile(MVEL.java:672)
>      at
> org.drools.rule.builder.PatternBuilder.setInputs(PatternBuilder.java:854)
>      at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:595)
>      at
> org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternB
> uilder.java:397)
>      at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:309)
>      at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:132)
>      at
> org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.jav
> a:65)
>      at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:80)
>      at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:2241)
>      at
> org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:802)
>      at
> org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java
> :388)
>      at
> org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder
> .java:566)
>      at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.ja
> va:35)
>      at
> com.proximetry.elmgr.services.DependenciesBean$Expander.addDrl(Depen
> denciesBean.java:110)
>
>
> It is
>
> (def0: EmParamDefinition(paramName == "p2", listIndex == -1) and
> EmParamValue(paramDefinitionId == def0, requiredValue == 1))
>
>
> line that causes the problem - the exeption disappears after removing it.
> What's interesting, when I add '$' sign to binding variable name, and the line
> looks like:
>
> ($def0: EmParamDefinition(paramName == "p2", listIndex == -1) and
> EmParamValue(paramDefinitionId == $def0, requiredValue == 1))
>
>
> instead of the exception I get DRL error:
>
> [DialectError message='Unable to wire compiled classes, probably related to
> compilation failures:sun.reflect.generics.reflectiveObjects.WildcardTypeImpl
> cannot be cast to java.lang.Class']
>
>
> For completness, this is how I add DRL resources:
>
> public void addDrl(Reader rdr) {
>               KnowledgeBuilder kBuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder();
>
>               kBuilder.add( ResourceFactory.newReaderResource(rdr),
> ResourceType.DRL);
>               if( kBuilder.hasErrors() ){
>                   for( KnowledgeBuilderError err: kBuilder.getErrors() ){
>                       StackTrace.error(this, err);
>                   }
>                   throw new IllegalStateException( "DRL errors" );
>               }
>               knowledgeBase.addKnowledgePackages(
> kBuilder.getKnowledgePackages() );
>               }
>
>
> I would be grateful if someone has an idea, why after switching Drools
> version such problem exists.
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