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: Mark Proctor 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}