[rules-dev] [Bug] cannot invoke method: asList

[Wolfgang Laun]

Below is a self-contained DRL which, when run with 5.5.0,  throws an
exception "cannot invoke method asList". Remarkably, this only happens
when a second Project fact is inserted. (Haven't I heard this before?)

-W

import java.util.List;
import java.util.Arrays;
import java.util.ArrayList;

declare Project
@typesafe (false)
        list1 : List
        list2 : List
end

rule kickoff
salience 999999
when
then
    insert( new Project() );
    insert( new Project() );   // necessary to trigger the exception
end

rule " Config rule "
dialect "mvel"
no-loop true
when
    P : Project()
then
    modify(P) {
       list1 = Arrays.asList(10, 15, 20, 25),
       list2 = Arrays.asList(11, 2, 3, 4, 5, 10, 9, 8, 7)
    };
end

Exception in thread "main" Exception executing consequence for rule "
Config rule " in express: java.lang.RuntimeException: cannot construct
object
	at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
	at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
	at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
	at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
	at express.Main.execute(Main.java:77)
	at express.Main.main(Main.java:110)
Caused by: java.lang.RuntimeException: cannot construct object
	at org.mvel2.optimizers.impl.refl.nodes.ConstructorAccessor.getValue(ConstructorAccessor.java:63)
	at org.mvel2.ast.NewObjectNode.getReducedValueAccelerated(NewObjectNode.java:233)
	at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:42)
	at org.mvel2.ast.WithNode$ParmValuePair.eval(WithNode.java:281)
	at org.mvel2.ast.WithNode.getReducedValueAccelerated(WithNode.java:67)
	at org.mvel2.ast.InterceptorWrapper.getReducedValueAccelerated(InterceptorWrapper.java:40)
	at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
	at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123)
	at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119)
	at org.mvel2.MVEL.executeExpression(MVEL.java:930)
	at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:104)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
	... 7 more
Caused by: java.lang.RuntimeException: cannot invoke method: asList
	at org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.getValue(MethodAccessor.java:63)
	at org.mvel2.optimizers.impl.refl.nodes.VariableAccessor.getValue(VariableAccessor.java:37)
	at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108)
	at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:42)
	at org.mvel2.optimizers.impl.refl.nodes.ConstructorAccessor.executeAll(ConstructorAccessor.java:76)
	at org.mvel2.optimizers.impl.refl.nodes.ConstructorAccessor.getValue(ConstructorAccessor.java:43)
	... 18 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 4
	at org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.executeAll(MethodAccessor.java:149)
	at org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.getValue(MethodAccessor.java:48)
	... 23 more