[jboss-jira] [JBoss JIRA] Commented: (JBCL-17) New ClassLoader not finding generated classes in the bootstrap classloader

Wed Aug 20 00:49:23 EDT 2008

    [ https://jira.jboss.org/jira/browse/JBCL-17?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12425789#action_12425789 ] 

Aleksandar Kostadinov commented on JBCL-17:
-------------------------------------------

What if first getResource() is tried and if it returns null, then try loadClass()? Assuming a missing class is a rare condition we could possibly get the performance benefits and backwards compatibility together. I might be completely wrong tho :)

> New ClassLoader not finding generated classes in the bootstrap classloader
> --------------------------------------------------------------------------
>
>                 Key: JBCL-17
>                 URL: https://jira.jboss.org/jira/browse/JBCL-17
>             Project: JBoss ClassLoader
>          Issue Type: Bug
>          Components: ClassLoader
>    Affects Versions: JBossCL.2.0.0.Beta12
>            Reporter: Adrian Brock
>            Assignee: Adrian Brock
>             Fix For: JBossCL.2.0.0.CR1
>
>         Attachments: jboss-classloader.jar
>
>
> An optimisation in the new classloader is causing a backwards compatibility problem.
> When we load classes from the parent (bootstrap) classloader,
> we first check to see whether we can getResource() on the class file.
> This avoids excessive locking when many threads are trying to loadClass() on that classloader.
> However, if the class is a runtime generated class against that classloader getResource()
> will return null, leading to a ClassNotFoundException.
> While we've always done this optimization for JBoss ClassLoaders, it looks like we can't to do
> this non-jboss classloaders and maintain backwards compatibility.

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