[jboss-jira] [JBoss JIRA] Created: (JBRULES-1446) ClassCastException when iterating over an array using "from"

[Krzysztof Karski (JIRA)]

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)
    Affects Versions: 4.0.4
         Environment: Windows XP
            Reporter: Krzysztof Karski


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

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