Re: Need Help: GWT 2.12 Migration + gwtrpc-spring-1.02 Compatibility Issue

The relevant part:

"Error while loading class org.gwtrpcspring.RemoteServiceDispatcher Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletException Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletException from [Module [...]"

If you check the RemoteServiceDispatcher you'll see the following:

public class RemoteServiceDispatcher.java extends RemoteServiceServlet { ...

So now if you open the  RemoteServiceServlet.java you'll see the following imports:

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

It seems that you have used the non jakarta version of GWT? Or it does additionally exist in your classpath (redundantly).

You have to use the GWT jakarta version and not the javax version. Also make sure no dependency is loading the old version as a transitive dependency...

<dependency>
 <groupId>org.gwtproject</groupId>
 <artifactId>gwt-servlet-jakarta</artifactId>
  <version>${gwt.version}</version>
</dependency>
<dependency>
 <groupId>org.gwtproject</groupId>
 <artifactId>gwt-user</artifactId>
 <version>${gwt.version}</version>
</dependency>

And not:

<dependency>

 <groupId>org.gwtproject</groupId>

 <artifactId>gwt-servlet</artifactId>

 <version>${gwt.version}</version>

</dependency>

<dependency>

 <groupId>org.gwtproject</groupId>

 <artifactId>gwt-user</artifactId>

 <version>${gwt.version}</version>

</dependency>

Happy analyzing :--)

Arpan Ameta schrieb am Donnerstag, 26. Juni 2025 um 10:36:06 UTC+2:

Dear Team,

We have completed the migration of our application code by replacing all references from javax.* to jakarta.* to align with Jakarta EE 10 standards.

However, upon deploying the updated application to the WildFly 33 server, we are encountering a deployment failure. The server logs indicate a class loading issue during deployment, specifically related to org.gwtrpcspring.RemoteServiceDispatcher.

Please find the relevant portion of the error log below for your reference

Not generating any bean definitions from org.gwtrpcspring.RemoteServiceDispatcher because of underlying class loading error: Type javax.servlet.http.HttpServlet from [Module "deployment.phoenix.war" from Service Module Loader] not found.

...
Caused by: java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
...
Caused by: java.lang.ClassNotFoundException: javax.servlet.http.HttpServlet from [Module "deployment.phoenix.war"]

It seems that despite updating our application to use jakarta.servlet.*, some legacy classes or dependencies are still referencing javax.servlet.http.HttpServlet, which is no longer present in the Jakarta EE 10 runtime environment provided by WildFly 33.

We would appreciate your guidance on resolving this issue. Specifically, we are looking for advice on:

• Identifying and resolving any transitive dependencies still relying on javax.servlet

• Ensuring compatibility with WildFly 33's Jakarta EE 10 module structure

Please let us know if further information or logs are needed.

Thanks & Regards,
Arpan Ameta

On Monday, June 16, 2025 at 1:06:28 PM UTC+5:30 Lonzak wrote:

Yes we did successfully migrate our GWT project to GWT 2.12.1 and Java17 / Jakarta.

However we didn't use gwtrpc-spring...

First thing would be analyze whether the dependency could be thrown out. If that is not possible then I did the following:

As you mentioned the repo ( nexus.emergya.es ) seems offline but the original project is still online:

Binary: https://code.google.com/archive/p/gwtrpc-spring/downloads

Source: https://code.google.com/archive/p/gwtrpc-spring/source

For several old dependencies I had to create a Java17 / Jakarta version on my own, if there was no compatible version.

https://code.google.com/archive/p/gwtrpc-spring/source/default/commits

The last changes was to mavenize the project which is a start.

So what would I do?

1) Download the source and setup a github project

2) commit the original source 1:1 (to prove your base)

3) Upgrade the project to jakarta / java 17

4) Either add or remove missing transitive dependencies (like gilead-core ...) This one could be found here: https://github.com/lmco/eurekastreams-mvn-repo/tree/master/releases/net/sf/gilead/gilead4gwt/1.3.2

5) ...

Good luck!

Frank Hossfeld schrieb am Donnerstag, 12. Juni 2025 um 08:26:37 UTC+2:

I have stopped using RPC for years now. But I would suggest to copy the one class >>SpringRemoteServiceServlet<< of gwtrpc-spring  your project and change the import from >>javax.servlet<< to >>jakarta.servlet<< and of course, remove the dependency.

Arpan Ameta schrieb am Mittwoch, 11. Juni 2025 um 14:59:41 UTC+2:

We're currently migrating our legacy project from GWT 2.8.1 to GWT 2.12.0 to be compatible with JDK 17 and modern tooling. As part of this upgrade, we've updated the dependency from:

<dependency>
    <groupId>org.gwtrpcspring</groupId>
    <artifactId>gwtrpc-spring</artifactId>
    <version>1.01</version>
</dependency>

To :

<dependency>
    <groupId>org.gwtrpcspring</groupId>
    <artifactId>gwtrpc-spring</artifactId>
    <version>1.02</version>
</dependency>

We're facing the following challenges:

• Deployment fails in WildFly 33, throwing NoClassDefFoundError for javax.servlet.http.HttpServlet, which seems to originate from RemoteServiceServlet in the GWT RPC stack.

• The artifact gwtrpc-spring:1.02 isn't resolving from Maven Central, and the old configured repo http://www.mvnsearch.org/maven2/ is timing out.

• We're unsure if gwtrpc-spring 1.02 is compatible with GWT 2.12 and Jakarta EE 9+ (jakarta.servlet) changes.

📌 Has anyone successfully used gwtrpc-spring with GWT 2.12 and JDK 17?
📌 Any fork or alternative for gwtrpc-spring compatible with modern GWT and WildFly?
📌 Suggestions on resolving servlet dependencies (HttpServlet) when deploying in WildFly 33?

Any help, pointers, or even working examples would be greatly appreciated! 🙏

Thanks in advance!
— Arpan

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