[rules-users] Drools crash on simple drl

[Mark Proctor]

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unit test demonstrating your bug:
https://hudson.jboss.org/hudson/job/droolsjbpm-knowledge/lastSuccessfulBuild/artifact/droolsjbpm-introduction-docs/target/docbook/publish/en-US/html_single/index.html#gettingstarted

Mark
On 17/04/2012 16:42, Shur, Bob wrote:
> I'm repeating this post because I didn't get an answer last time. Is this the wrong place to report a bug? If so, where is the right place? I'm trying to understand whether this is really a bug or whether I'm doing something wrong.
>
> I have what looks to me like a Drools bug on a simple drl with declared classes. I'm using version drools-distribution-5.3.0.Final.
>
> I'm invoking it with this:
>
>          StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession();
>          List<Object>  facts = new ArrayList<Object>();
>          ksession.execute( facts );
>
> =============================
>
> I get this crash:
>
> 	Exception in thread "main" java.lang.NoClassDefFoundError: com/sample/Cap
> 	at ASMAccessorImpl_129541121334339192620.getValue(Unknown Source)
> 	at org.mvel2.optimizers.dynamic.DynamicGetAccessor.getValue(DynamicGetAccessor.java:73)
> 	at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:103)
> 	at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:42)
> 	at org.mvel2.MVEL.executeExpression(MVEL.java:952)
> 	...
>
> ==========================
>
> Here's the drl file:
>
> package com.sample
>
> import com.sample.*;
>
> declare Item
> 	id : int;
> end
>
> declare Priority
> 	name : String;
> 	priority : int;
> end
>
> declare Cap
> 	item : Item;
> 	name : String
> end
>
> rule "split cart into items"
> when
> then
> 	insert(new Item(1));
> 	insert(new Item(2));
> 	insert(new Item(3));
> end
>
> rule "Priorities"
> when
> then
> 	insert(new Priority("A", 3));
> 	insert(new Priority("B", 2));
> 	insert(new Priority("C", 5));
> end
>
> rule "Caps"
> when
> 	$i : Item()
> 	$p : Priority($name : name)
> then
> 	insert(new Cap($i, $name));
> end
>
> rule "test"
> when
> 	$i : Item()
> 	Cap(item.id == $i.id)	
> then
> 	System.out.println("Cap");
> end
>
> ====================
>
> Some observations:
> - If I comment out any of the insert lines, the crash goes away
> - If I change the first field of class Cap to be id:int instead of item:Item and make the corresponding changes, the crash goes away
>
>
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