ArrayIndexOutOfBoundsException when calling a method with more than two varargs parameters ------------------------------------------------------------------------------------------ Key: DROOLS-11 URL: https://issues.jboss.org/browse/DROOLS-11 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Reporter: Andreas Bentele Assignee: Mario Fusco Fix For: 6.0.0.Alpha1 I have a rule which uses a Java Interface ILogService with Varargs Parameter. When the rule is evaluated, an ArrayIndexOutOfBoundsException is thrown within MVEL2 code which evaluates the varargs parameters. The MVEL2 code works with two varargs parameters, but not with more than two varargs parameters. Drools Version: 5.5.0.Final {code} // Java Interface ILogService with varargs public interface ILogService { public void debug(String logMessage, Object... arg); ... } // Global definition ILogService global ILogService log; rule "..." ruleflow-group " ... " no-loop true salience 2 when ... then log.debug("{} {} {}", operation.getOrderNumber(), operation.getOperationNumber(), Long.valueOf($operationId)); end {code} * Breakpoint in org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.executeAll(Object, VariableResolverFactory, Method), Line 149: {code} for (int i = 0; i < vararg.length; i++) vararg[i] = parms[parms.length - length + i].getValue(ctx, vars); {code} * Debugging of this context: {code} vararg.length = 3 parms.length = 4 length = 2 i = 0 => vararg[0] = parms[4-2+0].getValue(ctx, vars); i = 1 => vararg[1] = parms[4-2+1].getValue(ctx, vars); i = 2 => vararg[2] = parms[4-2+2].getValue(ctx, vars); => vararg[2] = parms[4].getValue(ctx, vars); => java.lang.ArrayIndexOutOfBoundsException: 4 (because params is an array of length 4 and maximum index 3. {code} Complete Stacktrace: {code} MethodAccessor.executeAll(Object, VariableResolverFactory, Method) line: 149 MethodAccessor.getValue(Object, Object, VariableResolverFactory) line: 48 VariableAccessor.getValue(Object, Object, VariableResolverFactory) line: 37 ASTNode.getReducedValueAccelerated(Object, Object, VariableResolverFactory) line: 108 MVELRuntime.execute(boolean, CompiledExpression, Object, VariableResolverFactory) line: 85 CompiledExpression.getDirectValue(Object, VariableResolverFactory) line: 123 CompiledExpression.getValue(Object, VariableResolverFactory) line: 119 MVEL.executeExpression(Object, Object, VariableResolverFactory) line: 930 MVELConsequence.evaluate(KnowledgeHelper, WorkingMemory) line: 104 DefaultAgenda.fireActivation(Activation) line: 1287 DefaultAgenda.fireNextItem(AgendaFilter) line: 1221 DefaultAgenda.fireAllRules(AgendaFilter, int) line: 1456 ReteooStatefulSession(AbstractWorkingMemory).fireAllRules(AgendaFilter, int) line: 710 ReteooStatefulSession(AbstractWorkingMemory).fireAllRules() line: 674 StatefulKnowledgeSessionImpl.fireAllRules() line: 230 ... {code} I tried to create a simple test case to reproduce it, but the test case always worked - no Exception. but there was also another Stacktrace when stopping at a breakpoint in the LogService: {code} LogService.info(String, Object...) line: 60 Rule_Hello_World_4df945f15bc043ef85d8e1317cd461f1.defaultConsequence(KnowledgeHelper, ILogService) line: 7 Rule_Hello_World_4df945f15bc043ef85d8e1317cd461f1DefaultConsequenceInvokerGenerated.evaluate(KnowledgeHelper, WorkingMemory) line: not available Rule_Hello_World_4df945f15bc043ef85d8e1317cd461f1DefaultConsequenceInvoker.evaluate(KnowledgeHelper, WorkingMemory) line: not available DefaultAgenda.fireActivation(Activation) line: 1287 DefaultAgenda.fireNextItem(AgendaFilter) line: 1221 DefaultAgenda.fireAllRules(AgendaFilter, int) line: 1456 {code}