[jboss-jira] [JBoss JIRA] Commented: (JBRULES-2293) Classpath resources being scanned by ResourceChangeScanner could cause improper resource removal

[Steve Ronderos (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBRULES-2293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12489827#action_12489827 ] 

Steve Ronderos commented on JBRULES-2293:
-----------------------------------------

I just debugged through this again and unfortunately I don't think that what you have there will work exactly in my case.  The URL returned to me when using this.getClass().getResource() does not return a JarURLConnection when openConnection() is called.  

The best I can come up with right now is checking the path for "!" in the URL, maybe using URL.getFile() which returns a string.  I'm not sure if the ! is generic enough to check for it like this.  Also this may be a fix solely for those using the Oracle Classloader (OAS, OC4J)

> Classpath resources being scanned by ResourceChangeScanner could cause improper resource removal
> ------------------------------------------------------------------------------------------------
>
>                 Key: JBRULES-2293
>                 URL: https://jira.jboss.org/jira/browse/JBRULES-2293
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core
>    Affects Versions: 5.0.1.FINAL
>         Environment: Windows XP
> Java 5
> Running in Oracle OC4J 10.1.3.2
>            Reporter: Steve Ronderos
>            Assignee: Mark Proctor
>         Attachments: fix_for_classpath_resources.patch
>
>
> I encountered an issue today with my KnowledgeAgent removing resources from its RuleBase shortly after creating it.  I have the ResourceChangeScanner running in my application.
> I tracked the issue back to the scan() method in ResourceChangeScannerImpl.  It appears that the method is trying to identify resources that are no longer available and remove them from both the RuleBase and future scans.  To do this it is checking lastModified on the resource and on a result of 0 removing the resource.  The resources that I configured in my change-set definitely still exist, but due to URL handler implementation provided by my classloader, getLastModified always returns 0.  (The resource I'm retrieving is coming from a jar that is in my application's classpath and the URL handler implementation is oracle.classloader.SharedCodeSourceURL)
> Full Email Group trail: http://www.nabble.com/Issue-with-ResourceChangeScanner-td25792358.html
> Michael recommends to never scan classpath resources.

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