On starting - opening a .gan project file created in a previous session - the following error messages are generated:
Writing log to /home/nick/.ganttproject.d/.ganttproject-20201003222549.log
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.itextpdf.text.pdf.MappedRandomAccessFile$1 (file:/usr/share/ganttproject/plugins/2.8.11/org.ganttproject.impex.htmlpdf/lib/itextpdf-5.3.1.jar) to method java.nio.DirectByteBuffer.cleaner()
WARNING: Please consider reporting this to the maintainers of com.itextpdf.text.pdf.MappedRandomAccessFile$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
I’m using version 2.8.11