I have a problem related to disposing of resources.
I’m trying to retrieve portions of pdf files and combine them into a new
pdf file. I’m using Apache PDFBox for the purpose.
Splitting a pdf into pages creates a PDDocument for each page, and
PDDocuments need to be explicitly closed. If you do not, there’s a log
message that comes from the finalizer “Warning: You did not close a PDF
Document”.
I’ve prepared some naive code that demonstrates the problem. Here I’m
splitting a pdf and recombining it. When the finalizer eventually runs
every page in the pdf seems to produce an error message.
[org.apache.pdfbox/pdfbox "2.0.11"]
(import '[org.apache.pdfbox.multipdf PDFMergerUtility])(import
'[org.apache.pdfbox.multipdf Splitter])(import
'[org.apache.pdfbox.pdmodel PDDocument])
(let [pdf (PDDocument/load (File. "input.pdf"))
splitter (Splitter.)
pages (into [] (.split splitter pdf))
merger (PDFMergerUtility.)
append (fn [x y] (.appendDocument merger x y) x)
close #(when % (.close %))]
(try
(-> (reduce append (first pages) (rest pages))
(.save "output.pdf")
(close))
(finally
(close pdf)
(map close pages))))
Any help would be appreciated.
Also, are there any good resources online for best practice in dealing with
sequences of disposables?
Thanks,
Arthur
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