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1. Check whether and which of your modules contain Vaadin implementations.
2. If they do:
   1. Obtain the https://github.com/vaadin/framework8-migration-tool .
   2. Install it locally and run like a Java jar.
   3. The script automatically changes the imports of the affected classes and thus – in the majority of cases – will make your module(s) compatible with Vaadin 8.
3. As stated on https://vaadin.com/docs/framework/migration/migrating-to-vaadin8.html, some dependencies need to be added in order to use the compatible classes from Vaadin 7 (such as TextField ).
   

   Change the vaadin-server dependency from

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   <dependency> <groupId>com.vaadin</groupId> <artifactId>vaadin-server</artifactId> <version>7.7.6</version> </dependency>

   to 

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   <dependency> <groupId>com.vaadin</groupId> <artifactId>vaadin-compatibility-server</artifactId> <version>8.01.0<5</version> </dependency>

   The full list of compatibility packages available for Framework 8:

   • vaadin-compatibility-server
   • vaadin-compatibility-client
   • vaadin-compatibility-client-compiled
   • vaadin-compatibility-shared
   • vaadin-compatibility-themes

   To be able to use the new Vaadin 8 features, add also the following dependency:

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   <dependency> <groupId>com.vaadin</groupId> <artifactId>vaadin-server</artifactId> <version>8.01.0<5</version> </dependency>

   
   

Please see also the links in the Further reading section for additional information on upgrading from Vaadin 7 to Vaadin 8.

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• Either annotate the UI class as such with @Widgetset("com.vaadin.v7.Vaadin7WidgetSet") ,

• Or do it in your GW[i]TGWT configuration file by adding <inherits name="com.vaadin.v7.Vaadin7WidgetSet" /> .

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