[jboss-jira] [JBoss JIRA] (JBRULES-3630) Nested ClassPathResources within ChangeSet use wrong ClassLoader

[Chris Rankin (JIRA)]

    [ https://issues.jboss.org/browse/JBRULES-3630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720283#comment-12720283 ] 

Chris Rankin edited comment on JBRULES-3630 at 9/20/12 8:44 AM:
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According to the [Drools documentation|http://docs.jboss.org/drools/release/5.4.0.Final/drools-expert-docs/html/ch03.html#d0e2434]:
{quote}Using the ClassPath resource loader in Java allows you to specify the Class Loader to be used to locate the resource but this is not possible from XML. Instead, the Class Loader will default to the one used by the Knowledge Builder unless the ChangeSet XML is itself loaded by the ClassPath resource, in which case it will use the Class Loader specified for that resource.{quote}
In my case, both my {{ClassPath}} resource and my {{KnowledgeBuilder}} have been configured to use my custom class loader, and so I am forced to assume that the failure to locate the {{.drl}} file referred to by the change set is a bug in Drools.
                
      was (Author: chrisjr):
    According to the [Drools documentation|http://docs.jboss.org/drools/release/5.4.0.Final/drools-expert-docs/html/ch03.html#d0e2434]:
{quote}Using the ClassPath resource loader in Java allows you to specify the Class Loader to be used to locate the resource but this is not possible from XML. Instead, the Class Loader will default to the one used by the Knowledge Builder unless the ChangeSet XML is itself loaded by the ClassPath resource, in which case it will use the Class Loader specified for that resource.{quote}
In my case, both my {{ClassPath}} resource and my {{KnowledgeBuilder}} have been configured to use my custom class loader, and so I am forced to assume that the failure to locate the {{.drl}} file is a bug in Drools.
                  
> Nested ClassPathResources within ChangeSet use wrong ClassLoader
> ----------------------------------------------------------------
>
>                 Key: JBRULES-3630
>                 URL: https://issues.jboss.org/browse/JBRULES-3630
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core
>    Affects Versions: 5.1.1.FINAL, 5.4.0.Final
>         Environment: Win7 / Java6 / JBoss6
>            Reporter: Chris Rankin
>            Assignee: Mark Proctor
>
> I am trying to load a "rules" JAR dynamically. This JAR contains a {{change-set.xml}} and all of its DRL files:
> {code:XML}
> <?xml version="1.0" encoding="UTF-8"?>
> <change-set xmlns='http://drools.org/drools-5.0/change-set'
>     xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
>     xs:schemaLocation='http://drools.org/drools-5.0/change-set http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/main/resources/change-set-1.0.0.xsd'>
>     <add>
>         <resource source='classpath:com/my/stuff/rules/Stuff.drl' type='DRL' />
>     </add>
> </change-set>
> {code}
> I am loading the JAR dynamically via {{URLClassLoader}} and _successfully_ creating the ChangeSet resource:
> {code}
> Resource changeSet = ResourceFactory.newClassPathResource("change-set.xml", classLoader);{code}
> However, it then always explodes when I try to add the resource to the {{KnowledgeBuilder}}, complaining that "'com/my/stuff/rules/Stuff.drl' cannot be opened because it does not exist".
> I am suspecting that the {{KnowledgeBuilder}} is not using my class loader to load {{Stuff.drl}}, despite me passing the correct class loader in via {{KnowledgeBuilderConfiguration}}. (And the "changeset:" handling in {{org.drools.xml.changeset.ResourceHandler}} would seem to support my theory.)

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