Re: migrating GWT2.8.2 to 2.12.2 , GWT version and plugin both

I'm afraid you're not providing enough information for us to help.

First, I'm assuming you read https://tbroyer.github.io/gwt-maven-plugin/migrating.html, as well as https://tbroyer.github.io/gwt-maven-plugin/index.html and https://tbroyer.github.io/gwt-maven-plugin/usage.html. If you haven't already, I'd suggest studying the structure of a project generated from the gwt-maven-archetypes: https://github.com/tbroyer/gwt-maven-archetypes/ or the e2e project used in tests (https://github.com/tbroyer/gwt-maven-plugin/tree/main/src/it/e2e)

How's your code organized in your project? Is the client code in a separate project from the server code? Or both in the same project?

How did you configure the net.ltgt.gwt.maven:gwt-maven-plugin? How was the CodeHaus Mojo plugin configured?

You're mentioning src/main/java in the structure of "Third-Party JAR (T1)", does it mean it's a project in the same Maven reactor build? Or is it really a third-party JAR and it actually doesn't have a src/main/java?

The best way to troubleshoot is to run with debug logs (mvn -X) and look for two lines starting with "Classpath:" and "Arguments:" respectively. You can also compare their content vs. the content of the two lines starting with "Execute command" and "With CLASSPATH" emitted by the CodeHaus Mojo plugin in the debug logs.

On Sunday, November 23, 2025 at 7:07:47 PM UTC+1 Ism wrote:

Request for Help: Migrating GWT 2.8.2 → 2.12.2 (Plugin + Version)

We are in the process of migrating our project from GWT 2.8.2 to GWT 2.12.2, including switching from the old Mojo plugin to the new tbroyer gwt-maven-plugin.

• With GWT 2.8.2 + Mojo plugin, everything has worked fine for several years.

• After configuring the new plugin, we are running into issues.

Project Structure

Main Application Module com.test.Application.gwt.xml

This module inherits third-party JARs that contain both sources and their own .gwt.xml files:

<module> <inherits name="com.thirdparty.T1"/> </module>

Third-Party JAR (T1) Structure:

Code

src/main/java 

 └── com/thirdparty/... 

              └── T1.gwt.xml

Contents of T1.gwt.xml:

<module> <source path=""/> </module>

Problem

When migrating, compilation fails with:

Code

[ERROR] Line 40: No source code is available

Attempts so far:

• Tried <source path=""/>

• Tried <super-source path=""/>

Both approaches fail with the same error.

Question

How should we correctly configure the tbroyer gwt-maven-plugin and module definitions so that third-party JARs with embedded sources and .gwt.xml files are properly recognized under GWT 2.12.2?

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