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From "Simone Tripodi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OGNL-49) "Double-checked locking" anti-pattern in OgnlRuntime
Date Tue, 12 Jun 2012 21:05:42 GMT

    [ https://issues.apache.org/jira/browse/OGNL-49?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13293921#comment-13293921
] 

Simone Tripodi commented on OGNL-49:
------------------------------------

while applying the patch, the {{patch}} command refuses 16 changes, maybe because of the {{OgnlRuntime}}
class evolvement - can you please double check?
TIA,
-Simo
                
> "Double-checked locking" anti-pattern in OgnlRuntime
> ----------------------------------------------------
>
>                 Key: OGNL-49
>                 URL: https://issues.apache.org/jira/browse/OGNL-49
>             Project: Commons OGNL
>          Issue Type: Bug
>         Environment: java version "1.6.0_31"
> Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
> Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)
>            Reporter: Matt Whitlock
>            Assignee: Simone Tripodi
>            Priority: Critical
>         Attachments: 0001-ognl-avoid-double-checked-locking-anti-pattern-in-Og.patch
>
>
> OgnlRuntime in OGNL 3.0.5 has several occurrences of the "double-checked locking" anti-pattern.
This has already manifested in our product in the form of:
> ognl.MethodFailedException: Method "xxx" failed for object yyy [java.lang.NoSuchMethodException:
x.y.z.C.getFoo(java.lang.String)]
> But method x.y.z.C.getFoo(String) does exist, and in fact the same OGNL expression evaluates
correctly when it is tried again subsequently.
> There are 11 occurrences of double-checked locking in OgnlRuntime that must be corrected.
The simplest approach is to remove the unsynchronized accesses to the guarded structures.
A better approach would be to use ReadWriteLocks.

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