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"Server class 'javax.sql.DataSource' could not be found in the web app, but was found on the system classpath
[ERROR] Found resouce but unrecognized URL format: 'jrt:/java.sql/javax/sql/DataSource.class'"
In according to https://github.com/gwtproject/gwt/issues/9582 there is an issue with JettyLauncher. And it is recommended to use "CodeServer and a separate servlet container." Here is a discussion on Jetty in GWT: https://groups.google.com/g/google-web-toolkit-contributors/c/iU9hckIab2o?pli=1.
It means that one needs to run the application under Tomcat (a separate servlet container) instead of the embedded Jetty.