NPE when filling form

[Papick Garcia Taboada]

Hi,

I am moving from iText to PDFBox to fill out a form in a PDF document. 

This is mainly my code:

Resource contractResource = 
ctx.getResource("classpath:/META-INF/pdfs/contract.pdf");
PDDocument doc = PDDocument.load(contractResource.getInputStream());
PDDocumentCatalog docCatalog = doc.getDocumentCatalog();
PDAcroForm form = docCatalog.getAcroForm();

   setField(doc, "field1", field1Value);
   setField(doc, "field2", field2Value);
   setField(doc, "field3", field3Value);

response.setStatus(200);
response.setContentType("application/pdf");
doc.save(response.getOutputStream());


And the setField method populates the fields:


private void setField(PDDocument doc, String fieldName, String value) throws 
IOException {
                PDDocumentCatalog docCatalog = doc.getDocumentCatalog();
                PDAcroForm form = docCatalog.getAcroForm();
                PDField field = form.getField(fieldName);
                if (field != null) {
                        if (!Strings.isNullOrEmpty(value)) {
                                field.setValue(value);
                        } else {
                                LOG.debug("Value for {} is empty", fieldName);
                        }
                } else {
                        LOG.debug("Field {} not found", fieldName);
                }
        }


Unfortunately, I get a NPE as soon as I try to set the field. 

java.lang.NullPointerException
        at 
org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.calculateFontSize(PDAppearance.java:558)


Any tips?

brgds,

Papick