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

java.util.Calender is not an emulated class in GWT.  You cannot use it in the client.  I would guess org.hibernate.Hibernate is the same.

Is the code that uses these classes meant to be in your server module (not your client or shared module)?

On Tuesday, 25 November 2025 at 5:17:18 am UTC+11 Ismail Shaik wrote:

Thank you all for the quick response.

I followed exactly how described in the plugin page. now getting java.util.Calender, org.hibernate.Hibernate etc missing.Do i need to   add additional for gwt2.12?

Please note we are also upgrading GXT4.0.X to 4.2.X along with Gwt2.8.2 to 2.12.2 . ofcourse pluginmigrating.

working configuration for smae codebase: Gwt2.8.2, Gxt4.0.2 and mojo plugin 2.8.2. i will try to mask share the code

thanks

On Mon, Nov 24, 2025 at 5:22 AM Craig Mitchell <ma...@craig-mitchell.com> wrote:

I don't have any source path.  All I have is the "inherits".

Eg:  I use Elemental2, which has a Core.gwt.xml file in the elemental2.core package in the jar (in the Core.gwt.xml, it has <source path=""/>)

All I had to do was add it in my client pom.xml:

<dependency>
  <groupId>com.google.elemental2</groupId>
  <artifactId>elemental2-core</artifactId>
  <version>${elemental2.version}</version>
</dependency>

And add the inherits in my module.gwt.xml file:

<inherits name="elemental2.core.Core"/>

And everything works great.

On Monday, 24 November 2025 at 6:05:01 pm UTC+11 RobW wrote:

Just checked our files - we just have the following in that area:

    <source path="client" />
    <!-- the below seems to be needed to help resolving ImageResource annotations -->
    <resource path="public" />

We follow the normal ./client, ./server, ./public structure from way back when GWT started.

On Sunday, 23 November 2025 at 18:34:29 UTC Thomas Broyer wrote:

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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Thanks
Ismail

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