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In Struts 2.3.15.2 the action mapping mechanism was changed to avoid circumventing security constraints. Two additional constants were introduced to steer behaviour of DefaultActionMapper:
- struts.mapper.action.prefix.enabled - when set to false support for "action:" prefix is disabled, set to false by default
- struts.mapper.action.prefix.crossNamespaces - when set to false, actions defined with "action:" prefix must be in the same namespace as current action
Another option is to write your own ActionMapper and completely drop support for "action:" prefix if support for multiple submit buttons isn't used. Consult manual how to write your own ActionMapper.
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