Problem with widgetset compilation in Vaadin 23 + Vaadin 7.7.32

[mlopezFC]

Description of the bug

In a simple Vaadin 23.0.9 + Vaadin 7.7.32 with MPR, when trying to compile the project, the widgetset compilation fails reporting an error with a gwt-user version that is different from the one explicitly used in the pom.xml file. In the pom.xml file I've explicitly defined that the gwt version being used is 2.8.2. If I run mvn dependency:tree I see that version 2.8.2 is being used, but then the errors mention version 2.7.0.vaadin7.

Minimal reproducible example

I'm attaching a simple project that is able to reproduce the issue. Just unzip it somewhere, and run mvn clean install mpr-v7-test.zip

Expected behavior

It should compile the project successfully

Actual behavior

The compilation fails with the following error:

[INFO] --- vaadin-maven-plugin:7.7.32:compile (default) @ mpr-v7-test ---
[INFO] auto discovered modules [AppWidgetset]
[INFO] Compiling module AppWidgetset
[INFO]    Tracing compile failure path for type 'java.util.InternalJsStringMap'
[INFO]       [ERROR] Errors in 'jar:file:/C:/Users/xxxx/.m2/repository/com/vaadin/external/gwt/gwt-user/2.7.0.vaadin7/gwt-user-2.7.0.vaadin7.jar!/com/google/gwt/emul/java/util/InternalJsStringMap.java'

Versions:

• Vaadin Framework: 23.0.9 + Vaadin 7.7.32
• Flow: 23.0.7
• MPR: 6.0.0
• Java JRE / JDK: 11.0.11, vendor: AdoptOpenJDK
• Operating System: Windows 10

[mlopezFC]

I was able to solve this issue inspired in this article, and did the following modifications:

• Use GWT version 2.9.0 because Vaadin 23 requires Java 11 and prior versions of GWT are not compatible
• Added a configuration for the directory where the generated files are placed:

  
  ...
              <configuration>
                  <generatedWidgetsetDirectory>${basedir}/src/main/java</generatedWidgetsetDirectory>
              </configuration>
  ...

* Avoid calling the goal "compile" in the vaadin-maven-plugin
* Added a new maven plugin configuration:

...

org.codehaus.mojo gwt-maven-plugin ${vaadin.gwt.version} ${basedir}/target/classes/VAADIN/widgetsets compile

...

And that did the trick, so I'm closing the ticket.