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https://issues.apache.org/struts/browse/WW-2834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Musachy Barroso resolved WW-2834.
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Resolution: Fixed
Fixed on xwork trunk already. messageFormats is now synchronized on that method.
> LocalizedTextUtil messageFormats cache is NOT thread safe
> ---------------------------------------------------------
>
> Key: WW-2834
> URL: https://issues.apache.org/struts/browse/WW-2834
> Project: Struts 2
> Issue Type: Bug
> Components: Core Interceptors
> Affects Versions: 2.0.11.2
> Reporter: Kirk Rasmussen
> Priority: Critical
> Fix For: 2.1.3
>
>
> Here is a snippet from com.opensymphony.xwork2.util.LocalizedTextUtil that
> illustrates one (could be more) problem. This could be easily fixed by using
> the JDK 1.5 ConcurrentHashMap collection instead. I guess technically this is
> an XWork problem but it is used by the default TextProvider implementation.
> private static final Map messageFormats = new HashMap();
> private static MessageFormat buildMessageFormat(String pattern, Locale
> locale) {
> MessageFormatKey key = new MessageFormatKey(pattern, locale);
> MessageFormat format = (MessageFormat) messageFormats.get(key);
> if (format == null) {
> format = new MessageFormat(pattern);
> format.setLocale(locale);
> format.applyPattern(pattern);
> messageFormats.put(key, format);
> }
> return format;
> }
> Also the MessageFormat class itself is not thread safe and must be
> syncronized.
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