Hi Abel,
You're right - there's a bug here. It affects 4.4 but not the 5.x
series.
The problem occurs because in Jess versions before 5.0, definstance is
in a separate package because the Jess 4.4 core code wants to remain
Java 1.0 compatible. As a result, the code for Rete.clear() needs to do
something special to allow for definstance, but it does not.
The easiest fix is simply to do a (load-package
jess.reflect.ReflectFunctions) after a (clear) (after all, (clear) is
only used during development, right?) This will reinitialize
definstance and everything will work correctly again.
The behaviour of (reset) when (clear) hasn't been called is correct -
definstances are not suposed to be removed by (reset).
I'm fairly sure now that when 5.0 goes final, 4.4 will become
"unsupported," although I will probably leave it up for download.
I think Abel Martinez wrote:
>
> Hi Jess users,
>
> I discovered the following strange behaviour while I was working
> with Jess 4.4:
>
> I tried to remove all the definstances using a (reset) command but
> it didn't work. Then I realized that if I type a (clear) command before
> loading the facts then later the definstances can be well-removed using
> the (reset) command.
>
> In other words the two scenarios are the following...
>
> The original sequence was:
>
> 1. load the facts
> 2. perform the task
> 3. do a (reset) command
>
> and the definstances were not deleted.
>
> -----------------------------------------
>
> But if the sequence is :
>
> 1. first at all, do a (clear) command
> 2. load the facts
> 3. perform the task
> 4. do a (reset) command
>
> then the definstances are deleted.
>
> Is this a properly behaviour? or
> Is any 'interference' between (clear) and (reset)?
>
> Can you help me to understand this?
>
> Thank you for your attention,
> Abel.
>
> --
> Abel Mart�nez
> Dept. Teoria del Senyal i Comunicacions - U.P.C.
> tel: (+34 93) 401 56 23
> e-mail: [EMAIL PROTECTED]
>
>
>
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---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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