How to build and run the pub sub tutorial in rosjava?

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Rosjava has been moving on - some up to date information (Nov '13) for appropriate tutorial documentation:

• Latest official stable release is on hydro (source branch, debs and maven artifacts)
• Official documentation starts at:
  • http://github.com/rosjava/rosjava_core
  • http://wiki.ros.org/rosjava
• Latest tutorial documentation at
  • http://rosjava.github.io/rosjava_core/latest/getting_started.html#executing-nodes
• Versioned tutorial documentation at
  • http://rosjava.github.io/rosjava_core/0.1.6/getting_started.html#executing-nodes

I just ran the tutorials, and they worked fine for me. I summarized what I found on a tutorial wiki page. http://ros.org/wiki/rosjava_core/Tutorials

For me the executable is located in build/install.

Maybe you can paste the contents of your build.gradle as well as the results of

$ find src
$ find build

here so that it is easier to understand what happened. For now I would suspect that you did not create the folder structure src/main/java as required by gradle.