Hi Shaik,
I typically don't like to be seeming to advertise on the mailing list, but we're doing much of the active development work in GWT these days. Ahmad Bawaneh and I wrote many of the patches to get GWT itself ready to run on newer Java versions, including updating its own build so that we can produce the release artifacts, run samples and build docs, and run tests on Java 11-21 (there is a pending PR that will fix one test to run on Java 22 now).
Work that will need to be done will vary based on the project - some will need none at all except for updating Java and GWT, while others might need to switch to jakarta.servlet, or deal with other classloader or --add-opens issues.
We can join a project directly and make changes in collaboration with your team, or work "over your shoulder" and join screensharing calls and answer emails to keep us more at arms length as consultants who can provide examples and solutions to specific questions. We have a standard NDA, or we can review and sign your own NDA.
I'll send an email directly, and am happy to be contacted off-list for any support we can offer around GWT and its ecosystem.
Thanks,
Colin