[ http://issues.apache.org/jira/brows...DAP-71?page=all ]

Jacob S. Barrett updated DIRLDAP-71:
------------------------------------

Attachment: CachingNormalizer-Concurrency.patch

> CachingNormalizer exhibits concurrency flaw under load.
> -------------------------------------------------------
>
>          Key: DIRLDAP-71
>          URL: http://issues.apache.org/jira/browse/DIRLDAP-71
>      Project: Directory LDAP
>         Type: Bug
>   Components: Common
>     Versions: 0.9.3
>     Reporter: Jacob S. Barrett
>  Attachments: CachingNormalizer-Concurrency.patch
>
> CachingNormalizer doesn't have it's cache protected from concurrent modifications.
  Under load a state is reached where cache.containsKey(key) is true but the result 
of cache.get(key) results in an unexpected null value and thus a NullPointerExceptio
n.
This is really only reached when you have more than threads than the max cac
he size and therefore items in the cache are being purged.  The attached pat
h synchronizes the cache.  It would be better to use a R/W lock from JSR 166
 backport or something sim
ilar.

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