[jboss-jira] [JBoss JIRA] (DROOLS-1540) Drools does not work with spring-boot-devtools

[Fabio Bonfante (Jira)]

    [ https://issues.jboss.org/browse/DROOLS-1540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737673#comment-13737673 ] 

Fabio Bonfante commented on DROOLS-1540:
----------------------------------------

First thank's for the fix, I've looked to the commit and try to figure out how I can safely use drools and the devtools in the future without too much "worries" about versions upgrades (of both of them).

I've a couple of questions:

# There's a specific version of spring-boot-devtools covered by the fix (1.5.x or 2.x) ? (saw that depends if the classLoader is an OSGI classloader... just for curiosity how this play a role with the devtools?)
# Can Drools detect if the object inserted in the kieSession have a different classloader than himself and throws an exception? 

I can imagine that the kieSession has reference to the classes imported in the drl file, and a check with an object inserted in the session can reveal if the same classes (using Class.getName() for example) have different classloaders. 

I'm surely missing (probably a lot of) details, but I think an exception like that could be helpful to prevent the current "silent" behaviour (es. [optaplanners rules don't fire|https://stackoverflow.com/questions/35746370/optaplanners-drools-rules-dont-fire-with-spring-boots-devtools-on-the-classpa]) in future deployments of drools not limited with this spring-boot-devtools corner case.


> Drools does not work with spring-boot-devtools
> ----------------------------------------------
>
>                 Key: DROOLS-1540
>                 URL: https://issues.jboss.org/browse/DROOLS-1540
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 6.5.0.Final, 7.20.0.Final
>            Reporter: G Xiong
>            Assignee: Mario Fusco
>            Priority: Critical
>         Attachments: complete.zip
>
>
> Drools does work with spring-boot-devtools.
> If you add in pom.xml the following, no rules will be fired in Drools.
> 		<dependency>
> 			<groupId>org.springframework.boot</groupId>
> 			<artifactId>spring-boot-devtools</artifactId>
> 		</dependency>
> if you comment out this, then rules will be fired in Drools.



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