Changes required

• Replace org.apache.struts2.config.Namespace with org.apache.struts2.convention.annotation.Namespace
• Replace org.apache.struts2.config.Results with org.apache.struts2.convention.annotation.Results
• Replace org.apache.struts2.config.Result with org.apache.struts2.convention.annotation.Result
• Update @Result uses to use result name instead of Class<Result>
• Update @Result uses to use location instead of value attribute
• Update web.xml and remove Codebehind params from filter
• Update CamelCase action results and references to match Convention. For example:

  Previously in Codebehind:
  Given an action named AnExampleAction, a request to /anExample -> AnExampleAction.execute() -> > anExample-index.ftl
  
  Now in Convention:
  Given an action named AnExampleAction, a request to /an-example -> AnExampleAction.execute() -> an-example-index.ftl
  

When REST plugin is used

Add these constants to struts.xml

<constant name="struts.convention.action.suffix" value="Controller"/>
<constant name="struts.convention.action.mapAllMatches" value="true"/>
<constant name="struts.convention.default.parent.package" value="rest-default"/>
<constant name="struts.convention.package.locators" value="example"/>