For a JavaBean to have a recognized property named "primarykey", then
the class must have a public, non-void, no-argument method named,
precisely, "getPrimarykey" -- i.e.,
public String getPrimarykey() { ... }
If it does not, then java,beans.Introspector (and thus Jess) won't
think there's such a property.
On Apr 8, 2009, at 5:48 PM, Juan Sequeda wrote:
Not sure if I explained myself correctly.
Initially I have the following deftemplate
(deftemplate PK (slot primarykey) (slot relation))
and several rules including
(defrule isObjProperty4D
"Determine Object Properties"
?fk <- (FK (foreignkey ?a)(relation ?r) {nonBinFK == TRUE})
(NN (attribute ?a))
(UNQ (attribute ?a))
(not(PK (primarykey ?a)))
=>
(printout t ?fk.foreignkey " foreign key of "?r" is an Object
Property and Functional Property and Inverse and Cardinality 1 (Rule
4D)" crlf)
)
However, if I change the deftemplate to
(deftemplate PK (declare (from-class PK)))
where my PK class has:
private String primarykey;
private String relation;
plus the constructor and getters,
then I get an error in the rule previously mentioned where I have PK:
Jess reported an error in routine Jesp.parsePattern.
Message: No such slot primarykey in template MAIN::PK at token
'primarykey'.
However, there is a slot "primarykey" in the PK class. And with the
previous deftemplate it works.
Any insights?
Thanks
Juan Sequeda, Ph.D Student
Dept. of Computer Sciences
The University of Texas at Austin
www.juansequeda.com
www.semanticwebaustin.org
On Wed, Apr 8, 2009 at 3:40 PM, Ernest Friedman-Hill <[email protected]
> wrote:
Not sure what "the exact same slot names as before" would mean, as
the names that JavaBeans getter methods must have are different from
the property names that get mapped into Jess templates. But even
given that, I think the property name "bRel" is problematic.
Remember that Jess follows the JavaBeans spec by using the
java.beans.Introspector class to find bean properties. The JavaBeans
spec includes a special case for names like "URLBase" that start
with multiple caps. If you have a getter name like "getBRel", the
JavaBeans property is "BRel", not "bRel". I think the only way to
have a property by this name is to use a BeanInfo class and
explicitly declare all the properties for your class. It would be
easier just to use well-formed names.
On Apr 8, 2009, at 4:15 PM, Juan Sequeda wrote:
Hi everybody
I have everything working in Jess. I define the deftemplates with
slots:
(deftemplate Rel (slot name) (slot bRel))
Now I am to embed jess in my java application. I was following the
Price example, and created a model: a class for each of the
templates and then replace it in my rules file:
(deftemplate Rel (declare (from-class Rel)))
The java class has the exact slot names as I had before. However,
the second slot, bRel, is not read.
if I replace it back to the original deftemplate with slots, it does
work. Any pointers?
Thanks
Jess reported an error in routine Jesp.parsePattern.
Message: No such slot bRel in template MAIN::Rel at token 'bRel'.
Program text: ( defrule isClass "Determine if a relation is a
Class" ?r <- ( Rel { bRel at line 25 in file generateOntology.clp.
at jess.Jesp.error(Unknown Source)
at jess.Jesp.a(Unknown Source)
at jess.InfixSlotParser.a(Unknown Source)
at jess.InfixSlotParser.a(Unknown Source)
at jess.InfixSlotParser.a(Unknown Source)
at jess.InfixSlotParser.if(Unknown Source)
at jess.InfixSlotParser.if(Unknown Source)
at jess.Jesp.a(Unknown Source)
at jess.Jesp.a(Unknown Source)
at jess.Jesp.if(Unknown Source)
at jess.Jesp.parseDefrule(Unknown Source)
at jess.Jesp.parseExpression(Unknown Source)
at jess.Jesp.promptAndParseOneExpression(Unknown Source)
at jess.Jesp.parse(Unknown Source)
at jess.Batch.batch(Unknown Source)
at jess.Batch.batch(Unknown Source)
at jess.Batch.batch(Unknown Source)
at jess.Batch.batch(Unknown Source)
at jess.Rete.batch(Unknown Source)
at
org.morphster.sql2sw.rules.OntologyEngine.<init>(OntologyEngine.java:
34)
at
org.morphster.sql2sw.rules.OntologyEngine.main(OntologyEngine.java:43)
Juan Sequeda, Ph.D Student
Dept. of Computer Sciences
The University of Texas at Austin
www.juansequeda.com
www.semanticwebaustin.org
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences Phone: (925) 294-2154
Sandia National Labs
PO Box 969, MS 9012 [email protected]
Livermore, CA 94550 http://www.jessrules.com
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Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com
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