For deployment, you cannot currently (with Gwt 2.2) deploy a gwt project that directly references other gwt projects. Instead, you need to export other projects to jar files and include jar files in the build path of the main project. As long as these jar files are present in war / WEB-INF / lib, it will be placed correctly.
For testing purposes, you can refer to the projects themselves in the build path for the placement mode, but as soon as you deploy it, you need to use the exported jar in the lib directory.
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