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Apache Struts 2 Documentation
Why is my action unavailable
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After migrating to Struts 2 from WebWork 2, some Actions suddenly exposes "HTTP Status 404 ... The requested resource is not available."

If the Actions utilize the "action!alias" sytax, add the line `struts.compatabilityMode.webwork=true` to the `struts.properties` file.

The bang syntax is deprecated, so rework the actions before updating to the next Struts 2 release.