[jira] [Created] (SLING-7319) Dynamic classloader should bootdelegate sun.reflect and jdk.internal.reflect

["Karl Pauls (JIRA)" <ji...@apache.org>]

Karl Pauls created SLING-7319:
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             Summary: Dynamic classloader should bootdelegate sun.reflect and jdk.internal.reflect 
                 Key: SLING-7319
                 URL: https://issues.apache.org/jira/browse/SLING-7319
             Project: Sling
          Issue Type: Bug
          Components: Commons
    Affects Versions: Commons ClassLoader 1.4.0
            Reporter: Karl Pauls
            Assignee: Karl Pauls
             Fix For: Commons ClassLoader 1.4.2


On java < 9 use of reflection can lead to accessor classes being magically generated in the sun.reflect namespace. On java >= 9, the same can happen but this time, inside the jdk.internal.reflect namespace. This posses a problem for classloaders that don't delegate to the system classloader. 

In case of the commons classloader, we right now delegate this somewhat implicitly via the bundle.loadClass don in the BundleProxyClassloader (it happens if the framework bootdelegates sun.reflect - which is the case for sling). However, in case of java9 we don't bootdelegate jdk.internal.reflect - hence, NCDF can happen after a while. 

Granted, one option would be to bootdelegate jdk.internal.reflect as well via the framework but in general, it seems the better option to just bootdelegate in the commons classloader directly (that makes it independent of the framework configuration). 



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