[rules-users] import static function with varargs as one of the parameters doesn't work?

Hi guys, I have a question regarding the import function feature in Drools 5.1.0M. I am reading the Drools JBoss Rules 5.0 book Developer's guide by Michal Bali and tried one of the examples but somehow I couldn't get my rules work with the method that has varargs. Here's what I have (copied from page 123): public class ValidationHelper { public static void error (RuleContext kcontext, Object... context) { KnowledgeRuntime knowledgeRuntime = kcontext.getKnowledgeRuntime(); ValidationReport validationReport = (ValidationReport)knowledgeRuntime.getGlobal("validationReport"); ReportFactory reportFactory = (ReportFactory) knowledgeRuntime.getGlobal("reportFactory"); kcontext.insertLogical(reportFactory.createMessage( Message.Type.ERROR, kcontext.getRule().getName(), context)); } } then in my drools file (copied from page 42): i have import org.drools.runtime.rule.RuleContext; import function ValidationHelper.error; ... rule test when #condition then error(drools) but when I ran the test, I got error message: Exception in thread "main" org.drools.runtime.rule.ConsequenceException: [Error: unable to resolve method: ValidationHelper.error(org.drools.base.DefaultKnowledgeHelper) [arglength=1]] If I remove the parameter Object... context, then everything worked. But I do need the varargs here because I need my error message to be more specific. Did anyone else encounter the same problems? thanks!