Hi there,
In our system we sometimes need to reload a rules file that may contain deftemplates. This could happen for example if a rule changes and needs to be redefined in the system. We reload the rules file with the updated rule. Since deftemplates cannot be redefined (without clearing out the rules engine first), we don't allow them to be modified; however they still may be in the file. I have seen the jess src code (jess70p1 - Deftemplate.java - line 155 "equals" method) where you check to see if a new deftemplate object matches an existing one of the same name. If they are identical there is no error. This works fine except where the deftemplate extends another deftemplate. It appears that the parent id of the extended deftemplate is different even though the parent template is identical. This error can be duplicated in a single script. Consider the following: (deftemplate t1 (slot s1)) (deftemplate t2 extends t1 (slot s2)) ; ; redefining t1 is no problem ; (deftemplate t1 (slot s1)) ; ; redefining t2 causes an error where you cannot redefine ; the template even though it is exactly the same. ; (deftemplate t2 extends t1 (slot s2)) I believe what is happening is that when t1 is redefined and added to the m_deftemplates TreeMap (Defmodule,java - line 125 "addDeftemplate" method) it is assigned a new id which does not match the id of t1 (as a parent) when template t2 is redefined. Thanks, - Howard
