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I developed a web app two years ago with Vaadin 7 and now I'm trying to run it with the latest plugin for Eclipse. The main servlet is asking me to implement some new methods, which seem to be important, and the thing won't load.

enter image description here

André Schild
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Eight Rice
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    **1)** What's the actual question, how to [migrate from 7 to 8](https://vaadin.com/docs/v8/framework/migration/migrating-to-vaadin8.html)? **2)** The error popup does not say anything about the servlet, it clearly states that `TimeinUI must implement ... SerializableTypeOracle.xxx()`, but we can't see the definition of the UI class in your screenshot. – Morfic Oct 13 '17 at 09:31
  • You need to post the actual code and error messages (if any) in the question itself – default locale Oct 13 '17 at 20:53

1 Answers1

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You have to follow the migration guide for a upgrade from vaadin 7 to vaadin 8.

Migration to vaadin 8

In short you have to change your pom.xml from

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

to

<dependency>
  <groupId>com.vaadin</groupId>
  <artifactId>vaadin-compatibility-server</artifactId>
  <version>8.0.0</version>
</dependency>

If you used one of the deprecated themese (Reindeer, Runo, Chameleon, Base) you have to add the vaadin-compatibility-themes dependency too.

As last step you have to change the imports to match the compatibility packages. You can either do it manually, or use this migration tool to handle it for you.

If you have own client side widgets, then you will need to upgrade these too.

André Schild
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