[rules-users] Drools crash on simple drl

[Michael Anstis]

It's the right place :)

It sounds like a bug (to me) :(

The core engine developers are trawling through a bunch of urgent bugs for
other requirements and may not answer here immediately.

If you've not heard anything in a week of two, I'd go banging on the door
again...

With kind regards,

Mike

On 17 April 2012 16:42, Shur, Bob <robert.shur at hp.com> 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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>
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