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https://issues.apache.org/jira/browse/WW-3933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18130765#comment-18130765
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Lukasz Lenart commented on WW-3933:
-----------------------------------
Closing as Won't Fix.
A web-fragment.xml that maps StrutsPrepareAndExecuteFilter cannot detect that
the application already declared the filter in web.xml, so the usual setup
would register it twice. It also cannot be switched off selectively: the only
ways to drop a fragment-declared mapping are metadata-complete="true" or an
absolute-ordering that omits the fragment, both of which affect every other
fragment in the deployment. These are the concerns raised in the comments above
and they still hold.
No comparable framework ships a fragment that maps a filter. Spring delegates
to user-written WebApplicationInitializer classes, Jersey registers its servlet
only when an @ApplicationPath application is present, and Log4j 2 uses its
fragment for ordering only and performs the registration in a
ServletContainerInitializer with an explicit opt-out. Spring Boot users
register the filter through a FilterRegistrationBean.
Descriptor-less registration remains possible as a separate improvement: a
ServletContainerInitializer that registers the filter only when no Struts
filter or servlet is already present, with an opt-out. That needs its own
design discussion and ticket, since it affects the split
StrutsPrepareFilter/StrutsExecuteFilter setup used with SiteMesh and would
expose any application that merely has struts2-core on the classpath.
> Provide web-fragment.xml for easier deployment on Servlet 3.0 compliant
> containers
> ----------------------------------------------------------------------------------
>
> Key: WW-3933
> URL: https://issues.apache.org/jira/browse/WW-3933
> Project: Struts 2
> Issue Type: Improvement
> Components: Dispatch Filter
> Affects Versions: 2.3.7
> Reporter: Daniel Le Berre
> Priority: Minor
> Fix For: 7.5.0
>
>
> Servlet 3.0 specification includes the possibility for libraries to ship
> web-fragment.xml files in their META-INF directory to contribute some
> declarations to the main web.xml file.
> Struts 2 only requires the declaration of a filter in the web.xml file to
> work. When building Servlet 3.0 webapp, the web.xml file is often not used at
> all.
> It would be nice to ship a web-fragment.xml file in struts 2 that declares
> the PrepareAndExecute filter to simplify the use of the framework on a
> servlet 3.0 stack.
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