Similar to these issues, but for Java and different output format
NullReferenceException during Pdf/A-1a conversion of Pdf with TextAnnotation and PopupAnnotation
System.NullReferenceException when using PdfFormat.ZUGF…...conversion of PDF with formats ZUGFeRD / PDF_A_4 / PDF_A_4E / PDF_A_4F...PDF_A_4F Aspose.PDF Product Family aspose-pdf-java ximaawa August 6,...