Migration from Struts 1 to Struts 2

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S1 with S2 it will overkill. Both frameworks are complicated, so the maintenance costs increase twice or more time. So, the strategy is to migrate completely to S2.

Both frameworks are implemented MVC pattern. Divide the application on three parts that should migrate separately: Model, Controller, and View. The order is not important, but logically is implied to follow the MCV order. The Model you’d probably not change, the Controller part requires to rewrite the configuration, the View is most difficult part, you have to rewrite S1 tags to S2 tags.

Migrating Struts 1.x to Struts 2.x:

You can use Struts1 actions under the struts1 plugin. Also consider to read the existing migration guide, solutions, and strategy that might help you in the migration process. Mapping actions could be easily done via convention plugin. You can’t use Struts1 JSP tags with Struts2, but you can use it in Struts1 if you are running both frameworks with the same application.

Integrate Struts with Spring:

The right and up-to-date approach is to migrate to Struts2. If you
concern the things why Struts is deprecated, you might read this
article: Is Struts Dead? Part III: I can’t kill Struts (Struts is
Deprecated) David Geary.

InfoQ Migration Guide:

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