GWT Module com.vaadin.v7.Vaadin7WidgetSet not found

Question

I have converted my existing project from vaadin 7 to vaadin 8 successfully. There is no error in the project, but when I use mvn install to build the project. I am getting this error:- GWT Module com.vaadin.v7.Vaadin7WidgetSet not found in project sources or resources.

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 02:51 min
[INFO] Finished at: 2017-12-19T12:31:15+05:30
[INFO] Final Memory: 94M/1007M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.vaadin:vaadin-maven-plugin:8.0.6:compile (default) on project XXX: GWT Module com.vaadin.v7.Vaadin7WidgetSet not found in project sources or resources. -> [Help 1]

Shaer

Please attach pom.xml – Tobit

Answer 1

From here:

Check the following:

You have to replace the vaadin-server dependency with vaadin-compatibility-server.

If you are using the default widgetset (you are not compiling it by yourself):

Replace the vaadin-client-compiled dependency with vaadin-compatibility-client-compiled.

Add @Widgetset("com.vaadin.v7.Vaadin7WidgetSet") to your UI implementations.

If you are using a custom widgetset:

Replace the vaadin-client dependency with vaadin-compatibility-client.

Recompile it.

In your POM I see these lines:

    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-server</artifactId>
        <version>7.5.10</version>
    </dependency>

    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-themes</artifactId>
        <version>7.5.10</version>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-client-compiled</artifactId>
        <version>7.5.10</version>
    </dependency>

    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-client</artifactId>
        <version>7.5.10</version>
        <exclusions>
            <exclusion>
                <groupId>javax.validation</groupId>
                <artifactId>validation-api</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

This won't work, you can't include any version 7 components, servers, clients. The only valid thing, is to use the v8-compatibility things.

Elo

I included all the compatibility dependencies in the pom but I also keep the existing dependencies with their versions and exclude that dependencies from new compatibility dependency. Is this approach causing the existing issue? – Shaer

Show your pom.xml file – Cervelat

Here is the POM.xml file – Shaer

Remove all vaadin.xxxx version 7.x dependencies in your pom.xml – Cervelat

This is a pretty huge project and if I remove 7.x dependencies it will affect multiple files. So I can't afford to remove those dependencies. Is there any way that, I can keep 7.x dependencies with 8.x and remove the occurred error. – Shaer

It's pretty simple to solve. Just replace all your imports of the corresponding UI elements and data elements to the compatibility package. com.vaadin.ui.TextField becomes com.vaadin.v7.ui.TextField. There is eve a maven task doing this for you. vaadin.com/docs/framework/migration/migrating-to-vaadin8.html There will be some minimal things to fix after this, but it should at least compile and run – Cervelat