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From "Guillaume Nodet (JIRA)" <j...@apache.org>
Subject [jira] Updated: (FELIX-953) Bundle#loadClass sometimes return null instead of throwing a CNFE
Date Mon, 23 Feb 2009 13:33:01 GMT

     [ https://issues.apache.org/jira/browse/FELIX-953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Guillaume Nodet updated FELIX-953:
----------------------------------

    Priority: Blocker  (was: Major)

> Bundle#loadClass sometimes return null instead of throwing a CNFE
> -----------------------------------------------------------------
>
>                 Key: FELIX-953
>                 URL: https://issues.apache.org/jira/browse/FELIX-953
>             Project: Felix
>          Issue Type: Bug
>          Components: Framework
>            Reporter: Guillaume Nodet
>            Priority: Blocker
>         Attachments: FELIX-953.patch
>
>
> Here is a patch:
> {code}
> Index: src/main/java/org/apache/felix/framework/Felix.java
> ===================================================================
> --- src/main/java/org/apache/felix/framework/Felix.java (revision 746347)
> +++ src/main/java/org/apache/felix/framework/Felix.java (working copy)
> @@ -1338,7 +1338,12 @@
>                  throw new ClassNotFoundException(name, ex);
>              }
>          }
> -        return bundle.getCurrentModule().getClassByDelegation(name);
> +        Class clazz = bundle.getCurrentModule().getClassByDelegation(name);
> +        if (clazz == null)
> +        {
> +            throw new ClassNotFoundException(name);
> +        }
> +        return clazz;
>      }
>  
>      /**
> {code}
> I'm wondering if there any reason why ModuleImpl#getClassByDelegation(String) returns
null instead of throwing a NPE.
> Browsing through the code, it seems there are several places where a null value is checked,
then a CNFE thrown.
> This would also avoid possible NPE in felix code as in Felix#createBundleActivator.
> I think it would be nice to iron the definition of IModule#getClassByDelegation to either
remove the thrown CNFE or never returns null, as currently both can happen.
> The IWire interface has exactly the same problem.
> I will try to come up with a patch which will never return a null value for both interfaces.

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