[jboss-jira] [JBoss JIRA] (DROOLS-600) ClassCastException when using FactTemplates

[Mario Fusco (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved DROOLS-600.
--------------------------------
    Fix Version/s: 6.2.0.CR1
       Resolution: Done


Fixed by https://github.com/droolsjbpm/drools/commit/3c124bee7

I fixed this because the fix was trivial and didn't make sense to leave it broken. However be aware that:

1. FactTemplates are not a public feature and very likely they will be removed in one of the next release. You can easily replace them with the more generic type declarations.

2. Not only FactTemplates but practically 100% of the code you're using in that code snippet you sent belongs to Drools private (and very old) API. All those classes are subject to disappear or to be heavily changed in a near future. I strongly suggest you to migrate your code to the new kie/drools API available with Drools 6.x

I hope this helps.

> ClassCastException when using FactTemplates
> -------------------------------------------
>
>                 Key: DROOLS-600
>                 URL: https://issues.jboss.org/browse/DROOLS-600
>             Project: Drools
>          Issue Type: Bug
>    Affects Versions: 6.1.0.Final
>            Reporter: Stephanie Kroll
>            Assignee: Mario Fusco
>             Fix For: 6.2.0.CR1
>
>
> We have embedded Drools in our project and use FactTemplates.  While attempting to upgrade from Drools 5.3 to 6.1, we are receiving a ClassCastException in org.drools.compiler.rule.builder.PatternBuilder when loading and compiling rules.
> The problem is evident upon inspection of the code.  In method build(RuleBuildContext, BaseDescr, Pattern), the local var objectType can be either a FactTemplateObjectType or a ClassObjectType, but line 258 does not check the type before attempting the cast.
> {noformat}
> java.lang.ClassCastException: org.drools.core.facttemplates.FactTemplateObjectType cannot be cast to org.drools.core.base.ClassObjectType
> 	at org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:258)
> 	at org.drools.compiler.rule.builder.PatternBuilder.build(PatternBuilder.java:138)
> 	at org.drools.compiler.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:66)
> 	at org.drools.compiler.rule.builder.RuleBuilder.build(RuleBuilder.java:89)
> 	at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addRule(KnowledgeBuilderImpl.java:1652)
> 	at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.compileRules(KnowledgeBuilderImpl.java:968)
> 	at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.compileAllRules(KnowledgeBuilderImpl.java:844)
> 	at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addPackage(KnowledgeBuilderImpl.java:838)
> 	at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addPackageFromDrl(KnowledgeBuilderImpl.java:339)
> 	at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addPackageFromDrl(KnowledgeBuilderImpl.java:315)
> 	...{noformat}



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