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https://issues.apache.org/jira/browse/OPENEJB-2070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13893520#comment-13893520
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Romain Manni-Bucau commented on OPENEJB-2070:
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it is faster for > 4-5 threads in general which is more or less never for this
classloader.
> Potential deadlock in URLClassLoaderFirst
> -----------------------------------------
>
> Key: OPENEJB-2070
> URL: https://issues.apache.org/jira/browse/OPENEJB-2070
> Project: OpenEJB
> Issue Type: Bug
> Components: container system
> Affects Versions: 4.6.0
> Environment: NA
> Reporter: Andy Gumbrecht
> Fix For: 4.6.1
>
>
> Calling org.apache.openejb.util.classloader.URLClassLoaderFirst#loadClass
> from one thread may cause a deadlock if Class.forName is called from another
> thread, as this internally calls ClassLoader.getCallerClassLoader() - Which
> may be the same URLClassLoaderFirst instance.
> Adding an ReentrantLock should be a viable solution.
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