Video for lesson 13 of OpenXava course

In our invoicing application we're using as example we want that when the user clicks to create a new invoice or order the default value for VAT will be 21, but also we want to change this default value in any moment without changing the source code. To achieve this we're going to use a @DefaultValueCalculator and write the logic to read the default value for VAT from a properties file.
Watch the video.

Video for lesson 13: @DefaultValueCalculator from file

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