Sample Java client applications are located in a directory in the Documentation and Samples directory (doc_samples) of the OpenEdge product ESD. For more information on accessing this directory, see the section on example procedures in the Preface.
You can also find the samples by going to the OpenEdge Product Documentation Overview page on Progress Communities:
https://community.progress.com/technicalusers/w/openedgegeneral/1329.openedge-product-documentation-overview.aspx.
This samples directory contains separate subdirectories for different sets of samples and support files. Each sample subdirectory contains a readme.txt file with instructions on building and running the sample.
This book references some of these samples, but also contains many other code samples and examples.