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From "Lukasz Lenart (JIRA)" <>
Subject [jira] [Updated] (OGNL-252) OgnlRuntime.invokeMethod can throw IllegalAccessException because of hash collisions
Date Wed, 04 Nov 2015 16:34:27 GMT


Lukasz Lenart updated OGNL-252:
    Fix Version/s:     (was: 3.0.12)

> OgnlRuntime.invokeMethod can throw IllegalAccessException because of hash collisions
> ------------------------------------------------------------------------------------
>                 Key: OGNL-252
>                 URL:
>             Project: Commons OGNL
>          Issue Type: Bug
>    Affects Versions: 3.0
>            Reporter: Carlos Saona
>            Priority: Critical
>             Fix For: 3.0.13
> Using Struts 2.3.24 and OGNL 3.0.6, one of our production servers was not rendering one
attribute of a specific page. It was weird because the other servers were rendering that same
page OK, and all had the same software version.
> Using the debugger, I found out that the problem was that OgnlRuntime.invoke method was
throwing IllegalAccessException when invoking a given method by reflection. The difference
between the working and non-working servers was that _methodAccessCache had different boolean
values for that method. The non-working server failed to force the accessibility of the method
because syncInvoke was set to false.
> Inspecting the code of OgnlRuntime.invokeMethod, I saw the cache is using the hash of
the method as a key, instead of the method itself. Therefore if two different methods that
have different accessibility have a hash collision in the cache, OgnlRuntime.invokeMethod
will throw an IllegalAccessException if the one that is accessible is cached before the one
that is not.
> I think this could be fixed by using the method itself as the map key, instead of its
hash value. Browsing the changelog, I saw that at least since 3.0.9 IntHashMap has been replaced
with ConcurrentHashMap, so the change would be quite straightforward. 
> If you agree with the diagnostic, I volunteer to fork and submit a pull request.

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