Thanks - the article was good, except for now I'm trying to do it outside Java, using straight SQL from the DB2 => prompt into a New record.
The Unix path of the image LOB file is /usr/appdata/TestImaging.pdf
The table has two other fields (Number (small integer) and Description (text))
insert into IMAGING values ("12345","/usr/appdata/TestImaging.pdf","Test Record") - fails.
I know I'm missing something here.