This method creates a PDF file and returns the binary PDF as a byte array. This particular line of code supposes that the resulting file is and fits into the available memory, but if this code can not make this 0% sure, then it is to an out of memory condition.

byte[] pdf = toPdf(file);

Moreover if it run server-side, that means in general many parallel threads. Bulk data should never by handled by byte arrays.

Streams should be used and the data should be spooled to disk or database.

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