fixed pdf/A failing form pdfA2 checkboxes and radioButtons

DEVSIX-592

Author: pavel-morozov-duallab

forms/src/main/java/com/itextpdf/forms/fields/PdfFormField.java

@@ -2318,6 +2318,10 @@ protected void drawRadioAppearance(float width, float height, String value) {
         PdfStream streamOff = new PdfStream().makeIndirect(getDocument());
         PdfCanvas canvasOff = new PdfCanvas(streamOff, new PdfResources(), getDocument());
         drawBorder(canvasOff, xObjectOff, width, height);
+        if (pdfAConformanceLevel != null && (pdfAConformanceLevel.getPart().equals("2") || pdfAConformanceLevel.getPart().equals("3"))) {
+            xObjectOn.getResources();
+            xObjectOff.getResources();
+        }
 
         PdfWidgetAnnotation widget = getWidgets().get(0);
 
@@ -2453,6 +2457,8 @@ protected void drawPdfA2CheckAppearance(float width, float height, String value,
 
         xObjectOn.getPdfObject().getOutputStream().writeBytes(streamOn.getBytes());
         xObjectOff.getPdfObject().getOutputStream().writeBytes(streamOff.getBytes());
+        xObjectOn.getResources();
+        xObjectOff.getResources();
 
         PdfDictionary normalAppearance = new PdfDictionary();
         normalAppearance.put(new PdfName(value), xObjectOn.getPdfObject());