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Save as print to pdf option using Java 8

I am watermarking pdf document using itext7 library. it is preserving layers and shows one of its signature invalid.
I want to flatten the created document.
When i tried saving the document manually using Adobe print option, it flattens all signature and makes the document as valid document. Same functionality i want with java program.
Is there any way using java program, we can flatten pdf document?

According to your tag selection you appear to be using iText 7 for Java.
How to flatten a PDF AcroForm form using iText 7 is explained in the iText 7 knowledge base example Flattening a form. The pivotal code is:
PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(DEST));
PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true);
// If no fields have been explicitly included, then all fields are flattened.
// Otherwise only the included fields are flattened.
form.flattenFields();
pdfDoc.close();
(https://kb.itextpdf.com/home/it7kb/examples/flattening-a-form visited 2021-05-24)

Unable to set Field Values using acrofields for form in Ms Word

I am trying to make a fillable pdf in Ms Word by providing forms like textField as explained here. Next i am trying to change the values of the form field as shown here.
However when i try it the values don't change and also the form.getFields().values() gives an empty array.
I have added the bookmarks to each field but still it gives no change in values.
Am i missing something?
Below is my tried code:
PdfReader reader = new PdfReader(PATH);
PdfStamper pdfStamper = new PdfStamper(reader,new FileOutputStream(newPATH));
AcroFields form = pdfStamper.getAcroFields();
System.out.println(form.getFields().values());
form.setField("Seller Info","Some Text");
form.setField("Buyer Info","Some Text");
form.setField("NoOfBundles", "3");
form.setField("InvoiceDate","2019/04/22");
pdfStamper.setFormFlattening(true);
pdfStamper.close();
reader.close();
This is the fillable pdf i am trying to create:
file
Thanks.

After much of googling,i tried using Open Office and by adding fields.setGenerateApperances(true) it worked as expected!
Also while exporting as pdf we need to select Create pdf form and select FDF as the submit form.

How to export data set using pdf template with itext?

In my project, some data sets are needed to be exported in PDF format.
I learned that iText is helpful, and PdfpTable can do the work, but it needs much code to deal with styles. While using PDF template can save time and code for adjusting style, but I can only set certain fields left in the template.
Can you give me some suggestions to show the data sets using commands like foreach? Thanks in advance!
Here are my code using pdfpTable, which has done the work, but the code is a little ugly:
PdfPTable pdfTable = createNewPDFTable();
for (int i = 0; i < dataSet.size(); i++) {
MetaObject metaObject = SystemMetaObject.forObject(dataSet.get(i));
for (String field : fields) {
Phrase phrase = new Phrase(String.valueOf(metaObject.getValue(field) != null ? metaObject.getValue(field) : "")
, PDFUtil.createChineseSong(DEFAULT_CELL_FONT_SIZE));
PdfPCell fieldCell = new PdfPCell(phrase);
fieldCell.setBorder(Rectangle.NO_BORDER);
fieldCell.setFixedHeight(DEFAULT_COLUMN_HEIGHT);
fieldCell.setHorizontalAlignment(Element.ALIGN_CENTER);
fieldCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
pdfTable.addCell(fieldCell);
}
}
Here are some code using pdfp template,which is copied from itext examples, the work is unfinished yet because i haven't find a proper way to show the data set.
PdfReader reader = new PdfReader(src);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
AcroFields form = stamper.getAcroFields();
form.setField("text_1", "Bruno Lowagie");
form.setFieldProperty("text_1", "setfflags", PdfFormField.FF_READ_ONLY, null);

There is an inconsistency in your question. You write: PdfpTable can do the work, but it needs much code to deal with styles. However, in your first code snippet, you don't really create your PDFs the way one would expect. Instead of producing a high volume of finished PDFs, you create use PdfPTable to create a template. I assume you then use that template to create a high volume of finished PDFs.
If you want to use a template and populate it afterwards, you shouldn't create your form using iText. Create it manually, for instance using Open Office or Libre Office. See for instance the example in chapter 6 of my book (section 6.3.5). Create the template with a tool that has a GUI, then fill out that template many times using iText.
This approach has some down-sides: all the content has to fit the fields you define. All fields have a fixed position on a fixed page.
If "applying styles through code" is a problem, you may want to follow the approach described in the ZUGFeRD book. In that book, we create HTML first: Creating HTML invoices.
Once you have the HTML, then convert the HTML to PDF, and use CSS to apply styles: Creating PDF invoices.
This is how we create a ZUGFeRDDocument:
ZugferdDocument pdfDocument = new ZugferdDocument(
new PdfWriter(fos), ZugferdConformanceLevel.ZUGFeRDComfort,
new PdfOutputIntent("Custom", "", "http://www.color.org",
"sRGB IEC61966-2.1", new FileInputStream(INTENT)));
pdfDocument.addFileAttachment(
"ZUGFeRD invoice", dom.toXML(), "ZUGFeRD-invoice.xml",
PdfName.ApplicationXml, new PdfDictionary(), PdfName.Alternative);
pdfDocument.setTagged();
HtmlConverter.convertToPdf(
new ByteArrayInputStream(html), pdfDocument, getProperties());
The getProperties() method looks like this:
public ConverterProperties getProperties() {
if (properties == null) {
properties = new ConverterProperties()
.setBaseUri("resources/zugferd/");
}
return properties;
}
You can find other examples on how to use HTML to PDF here: pdfHTML add-on (read the introduction).
Note that you are using an old version of iText. The examples I shared are using iText 7. There's a huge difference between iText 5 and iText 7.

Java PDFBox does not maintain the font appearence of a field if it appears severraly in a PDF Form

I need to fill a pdf form dynamically from my java web app and I found PDFBox to be really useful except for an issue or challenge am facing when I have multiple fields with same name.
I have 5 fields with same name(lets say 'wcode') in different places on a one page pdf form. This fields have different fonts. Normally when you fill out one field manually the other fields automatically pick the sames value, the same this happens when I fill it using PDFbox except that PDFBox changes all my 5 fields to have same font as the first field to appear in the pdf form.
Here is the code used to fill the field.
PDDocument _pdfDocument = PDDocument.load(new File(originalPdf))
PDAcroForm acroForm = _pdfDocument.getDocumentCatalog().getAcroForm();
PDTextField myCodeField = (PDTextField) acroForm.getField("wcode");
if (myCodeField != null) {
myCodeField .setValue(my.getCode());
}
//Refresh layout && Flatten the document
acroForm.refreshAppearances();
acroForm.flatten();
_pdfDocument.save(outputFile);
I added
acroForm.refreshAppearances();
after some research but that did not change anything.
So if the first 'wcode' field to appear on the pdf form is 6pt all the other 'wcode' fields in the rest the pdf will be 6pt even if I had set them in appearance properties to 12pt.
I am using PDFBox 2.0.5

The issue has been resolved in version PDFBox 2.0.6 released about a month ago.
Check comment on the jira 3837 here

How to automate PDF form-filling in Java

I am doing some "pro bono" development for a food pantry near where I live. They are inundated with forms and paperwork, and I would like to develop a system that simply reads data from their MySQL server (which I set up for them on a previous project) and feeds data into PDF versions of all the forms they are required to fill out. This will help them out enormously and save them a lot of time, as well as get rid of a lot of human errors that are made when filling out these forms.
Not knowing anything about the internals of PDF files, I can foresee two avenues here:
Harder Way: It is possible to scan a paper document, turn it into a PDF, and then have software that "fills out" the PDF simply by saying "add text except blah to the following (x,y) coordinates..."; or
Easier Way: PDF specification already allows for the construct of "fields" that can be filled out; this way I just write code that says "add text excerpt blah to the field called *address_value*...", etc.
So my first question is: which of the two avenues am I facing? Does PDF have a concept of "fields" or do I need to "fill out" these documents by telling the PDF library the pixel coordinates of where to place data?
Second, I obviously need an open source (and Java) library to do this. iText seems to be a good start but I've heard it can be difficult to work with. Can anyone lend some ideas or general recommendations here? Thanks in advance!

You can easily merge data into PDF's fields using the FDF(Form Data Format) technology.
Adobe provides a library to do that : Acrobat Forms Data Format (FDF) Toolkit
Also Apache PDFBox can be used to do that.

Please take a look at the chapter about interactive forms in the free ebook The Best iText Questions on StackOverflow. It bundles the answers to questions such as:
How to fill out a pdf file programatically?
How can I flatten a XFA PDF Form using iTextSharp?
Checking off pdf checkbox with itextsharp
How to continue field output on a second page?
finding out required fields to fill in pdf file
and so on...
Or you can watch this video where I explain how to use forms for reporting step by step.
See for instance:
public void manipulatePdf(String src, String dest) throws DocumentException, IOException {
PdfReader reader = new PdfReader(src);
PdfStamper stamper = new PdfStamper(reader,
new FileOutputStream(dest));
AcroFields fields = stamper.getAcroFields();
fields.setField("name", "CALIFORNIA");
fields.setField("abbr", "CA");
fields.setField("capital", "Sacramento");
fields.setField("city", "Los Angeles");
fields.setField("population", "36,961,664");
fields.setField("surface", "163,707");
fields.setField("timezone1", "PT (UTC-8)");
fields.setField("timezone2", "-");
fields.setField("dst", "YES");
stamper.setFormFlattening(true);
stamper.close();
reader.close();
}

public void fillPDF()
{
try {
PDDocument pDDocument = PDDocument.load(new File("D:/pdf/pdfform.pdf")); // pdfform.pdf is input file
PDAcroForm pDAcroForm = pDDocument.getDocumentCatalog().getAcroForm();
PDField field = pDAcroForm.getField("Given Name Text Box");
field.setValue("firstname");
field = pDAcroForm.getField("Family Name Text Box");
field.setValue("lastname");
field = pDAcroForm.getField("Country Combo Box");
field.setValue("Country");
System.out.println("country combo" );
field = pDAcroForm.getField(" Driving License Check Box");
field = pDAcroForm.getField("Favourite Colour List Box");
System.out.println("country combo"+ field.isRequired());
pDDocument.save("D:/pdf/pdf-java-output.pdf");
pDDocument.close();
} catch (IOException e) {
e.printStackTrace();
}
}