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https://issues.apache.org/jira/browse/TAPESTRY-1229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12466274
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Massimo Lusetti commented on TAPESTRY-1229:
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Kudos for this catch, i think i came accross this once or twice without
recognizing it, thanks!
> AssetService not thread safe
> ----------------------------
>
> Key: TAPESTRY-1229
> URL: https://issues.apache.org/jira/browse/TAPESTRY-1229
> Project: Tapestry
> Issue Type: Bug
> Components: Core, Framework
> Affects Versions: 4.1.1
> Reporter: Greg Woolsey
> Priority: Blocker
> Fix For: 4.1.2
>
>
> AssetService declares this field:
> static final DateFormat CACHED_FORMAT = new SimpleDateFormat("EEE, d MMM
> yyyy HH:mm:ss Z", Locale.ENGLISH);
> However, DateFormat objects are explicitly NOT thread safe. We've
> encountered this in our in-house concurrency testing. We'll have to patch
> our local 4.1.1 to fix this before deploying our application.
> a quick search did not find any other references to SimpleDateFormat that
> look like they could have the same issue.
> A simple CommonsPool object pool of date format objects would fix the problem.
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