I hate to bring up a thread this old, but I'm currently trying to do the same thing.
I'm extremely new to docx4j, and OpenXML. I'm trying to take data from an Excel Spreadsheet and update it into an existing PowerPoint presentation that contains graphs, charts, and tables.
I've read through most of the documents, and I'm able to separate individual slides for manipulation, but I'm not sure how to access the specific data in the charts.
Any guidance anyone could provide would be extremely helpful.
Thanks so much in advanced!