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http://www.stripesframework.org/jira/browse/STS-843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ben Gunter resolved STS-843.
----------------------------
Resolution: Fixed
> DynamicMappingFilter may create multiple instances of StripesFilter
> -------------------------------------------------------------------
>
> Key: STS-843
> URL: http://www.stripesframework.org/jira/browse/STS-843
> Project: Stripes
> Issue Type: Bug
> Affects Versions: Release 1.5.6
> Environment: Tomcat 5.5, Java 1.6, Stripes 1.5.6
> Reporter: Peter Štibraný
> Assignee: Ben Gunter
> Fix For: Release 1.5.7
>
>
> Our web.xml does NOT have StripesFilter, but it does have
> DynamicMappingFilter (DMF) with configuration for StripesFilter.
> When DMF finds that there is no StripesFilter in servlet context, it tries to
> create its own:
> // Get a reference to a StripesFilter instance
> StripesFilter sf = getStripesFilter();
> if (sf == null) {
> initStripesFilter((HttpServletRequest) request, wrapper);
> sf = getStripesFilter();
> }
> Problem may occur when multiple threads execute this code at once. They all
> find that getStripesFilter() returns null, and go ahead to
> initStripesFilter(). This method is synchronized, but it doesn't check if
> filter wasn't already created by other thread. So it happily creates new
> StripesFilter, possibly for second or third time :-( This later causes
> problem in StripesFilter.getConfiguration() method when called outside of
> stripes-action. Stripes.getConfiguration() if there is only single
> configuration, and if it finds multiple configs, it throws exception :-(
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