Callbacks contain the program logic. They are methods of the action-pojo and are called at runtime when processing a url. See the url processing description for details.

What should a callback do?#

A typical sequence:

  • validate the values in url variables
  • access the business-layer and get the data
  • convert the data into a format suitable for the render-pojo
  • instantiate the render-pojo and provide the prepared data to it
  • call ZTemplates.getServletService().render(render-pojo) to render the data to the response

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