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[protege-discussion] [POSSIBLE VIRUS:###] Problem with protege, jesstab and distributed computing with JADE

Samson Tu swt at stanford.edu
Wed Oct 3 10:22:37 PDT 2007


You should contact the jesstab developer directly to resolve this 
problem. I don't think he monitors this mailing list.

Meanwhile, a possible workaround is to avoid using JessTab convenience 
functions. You can write your own instance-existp using pure Java/Jess, 
for example.

Samson

Sébastien Fournier wrote:
> Hello,
> 
> We are facing a strange problem with JessTab. We are using Jade, Jess and
> Protege under eclipse to make a multi_agent system. When two agents run
> the same jess rules using jesstab, the second halts without firing any 
> rules.
> 
> We are suspecting of jesstab because we tried the following tests:
> 
> - when we are not using a jesstab condition, like in the rule
> 
> (defrule i_900_start
>     (test (< 1 2))
>     =>
>     (make-instance PAGE of Web-Page (URL ?*Url*)
>         (Protocol "fdsf")
>         (Content-Type "erer")
>         (Length 10) ))
> 
> both agents run ok,
> 
> - but then when we run with a jesstab condition, as in
> 
> (defrule i_900_start
>     (test (not (instance-existp PAGE)))
>     =>
>     (make-instance PAGE of Web-Page (URL ?*Url*)
>         (Protocol "fdsf")
>         (Content-Type "erer")
>         (Length 10) ))
> 
> the 2nd agent halts without firing any rule.
> 
> - When we run them separately, they fire this rule normally.
> 
> So we draw the conclusion that in some way, one is interfering in the
> other by Jesstab.
> 
> We are using Jess version 7.0p1-1, Jesstab 1.6, Protege 3.2, Jade 3.4 and
> Eclipse 3.1. The ontology is attached in zip file.
> 
> Have you any idea of what is going on, a solution or even ways to
> circumvent the problem?
> 
> Thanks in advance for any help or hint!
> 
> Best regards
> 
> 
> 
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> 
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-- 
Samson Tu                    email: swt at stanford.edu
Senior Research Scientist    web: www.stanford.edu/~swt/
Stanford Medical Informatics phone: 1-650-725-3391
Stanford University          fax: 1-650-725-7944




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