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         -----------
         Java APIs considerations
         -----------

Introduction

  In this part of the migration guide we address the differences of the APIs
  in Struts Tiles and Apache Tiles\u0099.

  If you are a Tiles extension developer and you want to convert your existing
  extension, see {{{./extension.html}Tiles extensions}} migration guide.

Controllers and View Preparers

  In Apache Tiles\u0099, the concept of a Tiles <<<Controller>>>, i.e. an object that it is
  invoked before rendering a definition, has been replaced with
  <<<ViewPreparer>>>.

  The classes that implement the <<<Controller>>> interface must now implement
  the new <<<ViewPreparer>>> interface, or extend the <<<ViewPreparerSupport>>>
  class.

Tiles <<<ComponentContext>>>

  The <<<ComponentContext>>>, i.e. the Tiles-specific context in which the
  current attribute values are stored, has been renamed to
  <<<AttributeContext>>>.

  The method <<<getAttribute>>> returns an <<Attribute>>, and not an
  <<Attribute Value>>, i.e. a simple object.

   * Previous Migration Pages

     ** {{{./index.html}Introduction }}

     ** {{{./configuration.html}Tiles configuration files}}.

     ** {{{./tags.html}Tiles JSP tags}}

   * Next Migration Pages

     ** {{{./extension.html}Tiles extensions}}.