How shall I resolve the warning of Merging of Pdfs?

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I have been trying to merge pdfs. With this function, I am able to merge the pdfs, however , it throws warning. "[WARN] PDFMergerUtility - Removed /IDTree from /Names dictionary, doesn't belong there". Please let me know, the steps to resolve.
MergePdf Link: MergePDF

Accepted Answer

MarKf on 5 Apr 2023
Edited: MarKf on 5 Apr 2023
Nice little utility (and overall apache pdfbox functionality), I just tried it, it worked and it didn't even give me an error (because I don't have IDTrees in the pdfs I guess).
Anyway whenever there is a warning that one needs to suppress (like while in loop for example) you can get the warning identifier and shut it. However that might be more tricky for these internal functions maybe lacking identifiers. Try:
% [mwarn, mwarnid] = lastwarn; %to get id of warning thrown by process
wrn = warning('off',mwarnid); %like 'stats:statrobustfit:IterationLimit' or 'MATLAB:DELETE:FileNotFound'
% code
warning(wrn) %reset previous warning state
MarKf on 6 Apr 2023
I mean it's java stuff... You could try adding merger.setIgnoreAcroFormErrors(true) in the code of MergePDF above. You could also delete the IDtrees of both pdfs since you are likely not interested in keeping them and they are what's causing the issue, using the same utility (pdfbox). I'd say disabling the warnings is your safest bet.

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