Hi, In Jess 7.0b3, the default for definstance type changed from "dynamic" to "auto". If you specified "dynamic" as the last argument to definstance, then Jess would try to register itself with your Bean as a PropertyChangeListener; this used to be the default, so that you had to write "static" if you didn't want this behavior. The new default is "auto". In this case, Jess looks at the Bean to see if it accepts PropertyChangeListeners and only registers itself if the Bean does, indeed, accept them.
Jess's current definition of "indeed accepts them" is that the following two methods exist with these exact signatures: public void addPropertyChangeListener(PropertyChangeListener); public void removePropertyChangeListener(PropertyChangeListener); So if this worked for you in "dynamic" mode, my guess is that your Beans don't have the "removePropertyChangeListener" method. The right thing to do is add it, but a band-aid would be to say (definstance block ?g dynamic) This will work until you try "undefinstance" which, of course, won't work (it never did.) If I've guessed wrong, and it's something else, let me know, please! I think Dusan Sormaz wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] > I am running example that uses property change listeners to update shadow > fact when object changes. > > Problem that I have is that running same code in Jess7.0b2 and Jess7.0b4 > produces different results. Here is the log for both: > > Jess, the Rule Engine for the Java Platform > Copyright (C) 2005 Sandia Corporation > Jess Version 7.0b4 11/1/2005 > > Jess> (require defclasses) > defclasses > Jess> (bind ?g (new Block G)) > <Java-Object:edu.ohiou.imse.ise891.blockworld.Block> > Jess> (definstance block ?g) > <Fact-0> > Jess> (facts) > f-0 (MAIN::block (class <Java-Object:java.lang.Class>) (name "G") (OBJECT > <Java-Object:edu.ohiou.imse.ise891.blockworld.Block>)) > For a total of 1 facts in module MAIN. > Jess> (?g setName "gfd") > before PCS > after PCS > Jess> (facts) > f-0 (MAIN::block (class <Java-Object:java.lang.Class>) (name "G") (OBJECT > <Java-Object:edu.ohiou.imse.ise891.blockworld.Block>)) > For a total of 1 facts in module MAIN. > Jess> > > > Jess, the Rule Engine for the Java Platform > Copyright (C) 2005 Sandia Corporation > Jess Version 7.0b2 8/11/2005 > > Jess> (require defclasses) > defclasses > Jess> (bind ?g (new Block G)) > <External-Address:edu.ohiou.imse.ise891.blockworld.Block> > Jess> (definstance block ?g) > <Fact-0> > Jess> (facts) > f-0 (MAIN::block (class <External-Address:java.lang.Class>) (name "G") > (OBJECT <External-Address:edu.ohiou.imse.ise891.blockworld.Block>)) > For a total of 1 facts in module MAIN. > Jess> (?g setName "gfd") > before PCS > after PCS > Jess> (facts) > f-0 (MAIN::block (class <External-Address:java.lang.Class>) (name "gfd") > (OBJECT <External-Address:edu.ohiou.imse.ise891.blockworld.Block>)) > For a total of 1 facts in module MAIN. > Jess> > > > While Jess7.0b2 works as expected, Jess7.0b4 doe snot update fact when > object changes. > > Any ideas why is this happening? > > Dusan Sormaz > > > > ********************************************************************* > * Du_an _ormaz, PhD, Associate Professor > * Ohio University > * Industrial and Manufacturing Systems Engineering Department > * 277 Stocker Center, Athens, OH 45701-2979 > * phone: (740) 593-1545 > * fax: (740) 593-0778 > * e-mail: [EMAIL PROTECTED] > * url: <http://www.ent.ohiou.edu/~sormaz>http://www.ent.ohiou.edu/~sormaz > ********************************************************************* --------------------------------------------------------- Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
