Jess is simply saying there's no such slot in that fact. I would try
inserting a debugging print statement in the method below at the top,
something like
System.out.println(fact);
and see what you're actually dealing with - it probably isn't what
you're expecting.
I think Weihua Zhou wrote:
> hi, there,
>
> I just got a wired problem with jess.Fact class. In rule file, I defined
> a fact template and asserted several facts based on the template. Then
> in my java program, I was trying to get slot value as follows:
>
> public Task (Rete rete, Fact fact, int id) {
> try {
> setID(id);
> setObject(fact.getSlotValue("object").toString());
>
>
>setRequirements(fact.getSlotValue("requirements").listValue(rete.getGlobalContext()));
>
>
> setConstraints(fact.getSlotValue("constraints").listValue(rete.getGlobalContext()));
>
> Hashtable h = new Hashtable();
>
>
>h.put("elaboration",fact.getSlotValue("elaboration").listValue(rete.getGlobalContext()));
>
>
>
>h.put("dependency",fact.getSlotValue("dependency").listValue(rete.getGlobalContext()));
>
> setRelation(h);
> setStatus(fact.getSlotValue("status").toString());
>
>
>setDuration((int)fact.getSlotValue("duration").numericValue(rete.getGlobalContext()));
>
> setPriority(0);
> System.out.println("Creating task "+String.valueOf(id)+" ...");
> }
> catch (JessException je) {
> System.out.println(je);
> }
> }
>
> However, I always got error report from jess as "Jess reported an error
> in routine Fact.findSlot, Message: Attempt to access invalid slotname
> object." for the first time use of getSlotValue. In above case, say
> getSlotValue("object"). Did someone have the same problem before? Any
> suggestions and advice are greatly appreciated.
>
> thanks,
> David
>
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---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9012 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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