I need to generate charts using JFreeChart and then export them to PDF using Apache PDFBOX. I don\'t want to use iText as it cannot be used in proprietary software.
Copy the OutputStream from your chosen writeChartAs*() method in ChartUtilities to the InputStream used to create a PDXObjectImage in AddImageToPDF. A typical copyStream() implementation is shown here.
Addendum: Alternatively, use piped streams to copy from output to input, as shown here and here.