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But how can i know get the vaadin-push.jar. I never worked with ivy and dont know how it works. I tried by leftclick and refresh etc, but my Broadcaster.BroadcastListener still is missing for import in my project.
You should now call ivy resolve, i.e in Eclipse right click on your project and choose ivy->resolve. After that you can check that vaadin-push-7.2.x.jar is in your project build path. If something goes wrong check that vaadin-push.jar is loaded to ivy local repository( in ivy terms it is called cache). The default path is ~/.ivy2/cache/com.vaadin/vaadin-server/jars