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https://issues.apache.org/struts/browse/STR-3192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=47012#action_47012
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Paul Benedict commented on STR-3192:
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I don't see anyway around this.
> Why lazy instantiation of the MessageResourcesFactory in Struts 1.2.7?
> ----------------------------------------------------------------------
>
> Key: STR-3192
> URL: https://issues.apache.org/struts/browse/STR-3192
> Project: Struts 1
> Issue Type: Improvement
> Affects Versions: 1.2.7
> Reporter: Juan Carlos Blanco Martinez
> Priority: Critical
> Fix For: Pending Review
>
>
> Double-checked locking issue exists and one of the options to solve this is
> to use synchronization. In the class org.apache.struts.util.MessageResources,
> we use LAZY INSTANTIATION to instantiate MessageResourcesFactory:
> public synchronized static MessageResources getMessageResources(String
> config) {
> if (defaultFactory == null) {
> defaultFactory = MessageResourcesFactory.createFactory();
> }
> return defaultFactory.createResources(config);
> }
> Why not to use:
> EAGER INSTANTIATION
> private static MessageResourcesFactory defaultFactory =
> MessageResourcesFactory.createFactory();
> And then:
> public static MessageResources getMessageResources(String config) {
> return defaultFactory.createResources(config);
> }
> It would allow concurrent access to the method getMessageResources which at
> least in my case it may be called quite a few times.
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