Description
PDFAIdentificationSchema.setConformance(String) make next check for input data:
if (value.equals("A") || value.equals("B")) { TextType conf = createTextType(CONFORMANCE, value); addProperty(conf); } else { throw new .... }
but for PDF/A-2 and PDF/A-3 exist 3 conformances: A, B, U.
Proof link for PDF/A-2