ClassCastException when iterating over an array using "from" ------------------------------------------------------------ Key: JBRULES-1446 URL: http://jira.jboss.com/jira/browse/JBRULES-1446 Project: JBoss Drools Issue Type: Bug Security Level: Public(Everyone can see) Components: Reteoo Affects Versions: 4.0.4 Environment: Windows XP Reporter: Krzysztof Karski Assigned To: Mark Proctor Fix For: 4.0.5, 5.0.0-M1 To reproduce the error, please create the two following objects: package test; public class DomainObject { private String message; private int value; private double value2; public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } public int getValue() { return value; } public void setValue(int value) { this.value = value; } public double getValue2() { return value2; } public void setValue2(double value2) { this.value2 = value2; } } package test; public class DomainObjectHolder { DomainObject[] objects = new DomainObject[3]; public DomainObjectHolder(){ objects[0] = new DomainObject(); objects[0].setMessage("Message1"); objects[0].setValue(1); objects[0].setValue2(2); objects[1] = new DomainObject(); objects[1].setMessage("Message2"); objects[1].setValue(3); objects[1].setValue2(4); objects[2] = new DomainObject(); objects[2].setMessage("Message3"); objects[2].setValue(5); objects[2].setValue2(6); } public DomainObject[] getObjects(){ return objects; } } Here are a few rule that will trigger the ClassCastException: rule "Test Rule" when $holder : DomainObjectHolder() $object : DomainObject( $message : message) from $holder.objects; then System.out.println("Selected Object " + $message); end rule "Test Rule" when $holder : DomainObjectHolder() $object : DomainObject( ) from $holder.objects; then System.out.println("Selected Object " + $object.getMessage()); end This rule does not trigger the exception: rule "Test Rule" when $holder : DomainObjectHolder() $object : DomainObject( ) from $holder.objects; then System.out.println("Selected Object"); end Here is the exception message: java.lang.ClassCastException: [Ltest.DomainObject; cannot be cast to test.DomainObject at org.drools.base.test.DomainObject9939622$getMessage.getValue(Unknown Source) at org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:127) at org.drools.rule.Declaration.getValue(Declaration.java:198) at sequitem.quanteq.rules.exit.Rule_Test_Rule_0ConsequenceInvoker.evaluate(Rule_Test_Rule_0ConsequenceInvoker.java:17) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433) at sequitem.quanteq.rules.engine.StatefulEngine.execute(StatefulEngine.java:98) at sequitem.quanteq.rules.engine.StatefulEngine.execute(StatefulEngine.java:45) at sequitem.quanteq.tradesystem.RuleBasedTradeSystem.onStart(RuleBasedTradeSystem.java:186) at org.activequant.tradesystem.simple.TradeSystemBase.start(TradeSystemBase.java:242) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.activequant.container.context.TradeSystemContextBase.invoke(TradeSystemContextBase.java:134) at org.activequant.container.context.TradeSystemContextBase.access$2(TradeSystemContextBase.java:132) at org.activequant.container.context.TradeSystemContextBase$2.start(TradeSystemContextBase.java:152) at org.activequant.container.context.TradeSystemContextBase.start(TradeSystemContextBase.java:179) at sequitem.quanteq.backtest.exits.StandardExistBackTest.main(StandardExistBackTest.java:36) Exception in thread "main" java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.activequant.container.context.TradeSystemContextBase.invoke(TradeSystemContextBase.java:134) at org.activequant.container.context.TradeSystemContextBase.access$2(TradeSystemContextBase.java:132) at org.activequant.container.context.TradeSystemContextBase$2.start(TradeSystemContextBase.java:152) at org.activequant.container.context.TradeSystemContextBase.start(TradeSystemContextBase.java:179) at sequitem.quanteq.backtest.exits.StandardExistBackTest.main(StandardExistBackTest.java:36) Caused by: org.drools.spi.ConsequenceException: java.lang.ClassCastException: [Ltest.DomainObject; cannot be cast to test.DomainObject at org.drools.base.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:14) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433) at sequitem.quanteq.rules.engine.StatefulEngine.execute(StatefulEngine.java:98) at sequitem.quanteq.rules.engine.StatefulEngine.execute(StatefulEngine.java:45) at sequitem.quanteq.tradesystem.RuleBasedTradeSystem.onStart(RuleBasedTradeSystem.java:186) at org.activequant.tradesystem.simple.TradeSystemBase.start(TradeSystemBase.java:242) ... 9 more Caused by: java.lang.ClassCastException: [Ltest.DomainObject; cannot be cast to test.DomainObject at org.drools.base.test.DomainObject9939622$getMessage.getValue(Unknown Source) at org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:127) at org.drools.rule.Declaration.getValue(Declaration.java:198) at sequitem.quanteq.rules.exit.Rule_Test_Rule_0ConsequenceInvoker.evaluate(Rule_Test_Rule_0ConsequenceInvoker.java:17) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550) ... 16 more