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I was also facing the same problem. So I just downloaded the entire rosjava_core-hydro folder from github https://github.com/rosjava/rosjava_core/tree/hydro. This folder contains another sub folder called rosjava_tutorial_pubsub. Now when you enter into the build folder of this package you will find that the path matches exactly with what is given on the snapshot documentation which is

source your devel/setup.bash roscd rosjava_core cd rosjava_tutorial_pubsub ../gradlew installApp roscore & ./build/install/rosjava_tutorial_pubsub/bin/rosjava_tutorial_pubsub org.ros.rosjava_tutorial_pubsub.Talker

You can now run these commands and see hello world being passed from your talker.java to listener.java.