Just an idea, and just for curiosity, using a Gwt 2.7/2.6 application with 2.4 libs on the backend.. Is going to work?
If you use GWT-RPC then most likely not. GWT-RPC has a version number and it is likely that the version has been incremented between GWT 2.4 and 2.6/7. So you must use a matching gwt-servlet.jar on your server side.
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