[jboss-jira] [JBoss JIRA] (DROOLS-5135) Drools Setup › Exception Handling in Drools Rule Condition

[Mario Fusco (Jira)]

     [ https://issues.redhat.com/browse/DROOLS-5135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved DROOLS-5135.
---------------------------------
    Resolution: Rejected


Drools DRL is a strongly typed language.

As an exercise, let's try to do a similar exercise on what you're suggesting in Java. What you're asking is the equivalent of "I have a class Foo with, among other things, a method bar() that is called by other classes. I remove the method bar() and I would like my program, at least in the classes not using that method bar(), to work normally".

In my opinion this requirement doesn't make much sense and, in the same way as the whole Java program cannot be compiled  if there are still classes referencing that method bar(), so Drools cannot compile the whole rules base and generate its internal datastructures, necessary to evaluate those rules if any of them is malformed or references not existing types or properties.

>  Drools Setup › Exception Handling in Drools Rule Condition
> -----------------------------------------------------------
>
>                 Key: DROOLS-5135
>                 URL: https://issues.redhat.com/browse/DROOLS-5135
>             Project: Drools
>          Issue Type: Bug
>          Components: Guided Rule Editor
>    Affects Versions: 7.15.0.Final
>            Reporter: Bishnu Shankar Pandey
>            Assignee: Mario Fusco
>            Priority: Major
>
> How can we do rule wise exception handling in the drools rule condition?  My scenario is how to handle scenarios when the schema of an event changes.
> For example, let's say Initially  I have an event that has 5 members namely name,num1,num2,num3,num4. I started creating rules for the event and the rule engine is running for some time. After that let's assume there is a scenario in which one of the class members (say num4) is removed from the event because of some reason. Now what I can do now is to change the Event class, but all the rules associated with that member will give me exceptions. The exceptions will also affect other rules which can run with the current data. Is there any way to handle exception in rule condition for specific rule and restrict it to disturb the independent rules.



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