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The "action!alias" syntax is deprecated. The idiom is disabled by default, but it can be enabled via the struts.compatibilityMode.WebWork property setting. This setting will be removed in a future release.

The AroundInterceptor has been removed. If your application extends the AroundInterceptor, either import the class into your source code form WebWork 2 (pursuant to the Open Symphony License) and modify it to server as your own base class, or rewrite your interceptor.

Support for the "oldSyntax" is removed .

Rich text editor tag has been removed (a possible replacement would be to use the textarea tag with theme="ajax", this will used dojo's rich text editor)

 <s:textarea theme="ajax" /> 

The convention of trying a "do" form of an alias action method is not supported.

  <action name="..." method="submit">
    ...
  </action>

In the old syntax,
  * try to execute submit() method in the action
  * try to execute doSubmit() method in the action if Step 1] fail
  * fail
In Struts2
  * try to execute submit() method in the action
  * fail