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Page Content not Erasing with Rectangle fill in pdfbox

I am working on a requirement that , I need to mask the certain content based on Keys. With the PDF Rectangle fill i am able to mask well. But the user still able to get the content from masked region by selecting the text. How can i get rid of it.
PDDocument document = new PDDocument();
for (int i=0; i<1; i++) {
PDPage blankPage = new PDPage();
document.addPage( blankPage );
PDPageContentStream contentStream = new PDPageContentStream(document, document.getPage(0));
contentStream.beginText();
contentStream.setFont(PDType1Font.TIMES_ROMAN, 12);
contentStream.newLineAtOffset(25, 500);
String text = "This is the sample document and we are adding content to it.";
contentStream.showText(text);
contentStream.endText();
contentStream.setNonStrokingColor(Color.RED);
contentStream.addRect(25, 500, 100, 100);
contentStream.fill();
contentStream.close();
}
document.save("C:/PdfBox_Examples/my_doc.pdf");
System.out.println("PDF created");
document.close();

How to render Colored Text in Apache PDFBox

Yes, it seems a weird question, but I was not able to render a colored text in PDFBox.
Usually the code for generating text looks like that:
//create some document and page...
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDRectangle.A4);
//defined some font
PDFont helveticaRegular = PDType1Font.HELVETICA;
//content stream for writing the text
PDPageContentStream contentStream = new PDPageContentStream(document, page);
contentStream.beginText();
contentStream.setFont(helveticaRegular, 16);
contentStream.setStrokingColor(1f,0.5f,0.2f);
contentStream.newLineAtOffset(64, page.getMediaBox().getUpperRightY() - 64);
contentStream.showText("The hopefully colored text");
contentStream.endText();
//closing the stream
contentStream.close();
[...] //code for saving and closing the document. Nothing special
Interestingly the setStrokingColor is the only method accepting colors on the stream.
So I thought this is the way to color something in PDFBox.
BUT: I'm not getting any color to the text. So I guess this is a method for other types of content.
Does anybody know how to achieve a colored text in PDFBox?

You use
contentStream.setStrokingColor(1f,0.5f,0.2f);
But in PDFs text by default is not drawn by stroking a path but by filling it. Thus, you should try
contentStream.setNonStrokingColor(1f,0.5f,0.2f);
instead.

No glyph for U+000A in font NotoSerifDevanagari-Bold

i am trying to create pdf using pdfbox. i am storing EditText data as html in Sqlite DB.
now i am retrieving data from sqliteDB and creating pdf of that. this data is having marathi language as well as english language.
i am using NotoSerifDevanagari-Bold font and have added it to assets folder. from there i am accessing this font into code. but i am getting error. please find my code and error below.
AssetManager assetManager;
PDFBoxResourceLoader.init(getApplicationContext());
File FilePath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
assetManager = getAssets();
PDDocument document = new PDDocument();
PDPage page = new PDPage();
document.addPage(page);
PDFont font = PDType0Font.load(document, assetManager.open("notoserifdevanagaribold.ttf"));
PDPageContentStream contentStream;
// Define a content stream for adding to the PDF
contentStream = new PDPageContentStream(document, page);
Cursor data = mDatabaseHelper.getDataByDeckname(deckname);
StringBuilder builder=new StringBuilder();
while (data.moveToNext()) {
String front_page_desc = data.getString(3);
String back_page_desc = data.getString(4);
contentStream.beginText();
contentStream.setNonStrokingColor(15, 38, 192);
contentStream.setFont(font, 12);
contentStream.newLineAtOffset(100, 700);
contentStream.showText(Html.fromHtml(front_page_desc).toString());
contentStream.endText();
contentStream.beginText();
contentStream.setNonStrokingColor(15, 38, 192);
contentStream.setFont(font, 12);
contentStream.newLineAtOffset(100, 700);
contentStream.showText(Html.fromHtml(back_page_desc).toString());
contentStream.endText();
}
contentStream.close();
String path = FilePath.getAbsolutePath() + "/temp.pdf";
document.save(path);
document.close();
ERROR
W/System.err: java.lang.IllegalArgumentException: No glyph for U+000A in font NotoSerifDevanagari-Bold
I tried so many examples for above error but i am not able to fix the issue. this error i am getting on contentStream.showText(Html.fromHtml(front_page_desc).toString()); line. can someone please help me on above.

As per this link U+000A is the Unicode for new line. Any font will fail if you try to render it.
In order to avoid such error you can try something like this:
String[] lines = text.split("\\n");
for (String line : lines) {
if (!line.isBlank()) {
contentStream.showText(line);
// add new line here if you want to
}
}

Cant adding a TIFF to a pdf using PDFBox

Im trying to add a TIFF image (CCIT Group 3) to a PDF using Java and PDFBox 1.8.10. There is an image shown on the output file, but its displayed wrong. Its only some black and white pixels.
String outputPath = "/tmp/PDFImage.pdf";
String imagePath = "/tmp/header.tif";
PDDocument doc = new PDDocument();
PDPage page = new PDPage();
doc.addPage(page);
PDPageContentStream content = new PDPageContentStream(doc, page);
PDXObjectImage ximage = new PDCcitt(doc, new RandomAccessFile(new File(imagePath), "r"));
content.drawImage(ximage, 0, 500);
content.close();
doc.save(outputPath);
doc.close();
The PDFBox dependencies says : To write TIFF images a JAI ImageIO Core library will be needed.
I imported the library and and scanned for plugins, but dont found an example how to use is exactly. Someone can help ?

Can't add an image to a pdf using PDFBox

I'm writing a java app that creates a pdf from scratch using the pdfbox library.
I need to place a jpg image in one of the page.
I'm using this code:
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDPage.PAGE_SIZE_A4);
document.addPage(page);
PDPageContentStream contentStream = new PDPageContentStream(document, page);
/* ... */
/* code to add some text to the page */
/* ... */
InputStream in = new FileInputStream(new File("c:/myimg.jpg"));
PDJpeg img = new PDJpeg(document, in);
contentStream.drawImage(img, 100, 700);
contentStream.close();
document.save("c:/mydoc.pdf");
When I run the code, it terminates successfully, but if I open the generated pdf file using Acrobat Reader, the page is completely white and the image is not placed in it.
The text instead is correctly placed in the page.
Any hint on how to put my image in the pdf?

Definitely add the page to the document. You'll want to do that, but I've also noticed that PDFBox won't write out the image if you create the PDPageContentStream BEFORE the PDJpeg. It's unexplained why this is so, but if you look close at the source of ImageToPDF that's what they do. Create the PDPageContentStream after PDJpeg and it magically works.
...
PDJpeg img = new PDJpeg(document, in);
PDPageContentStream stream = new PDPageContentStream( doc, page );
...

Looks like you're missing just a document.addPage(page) call.
See also the ImageToPDF example class in PDFBox for some sample code.

this is how default constructor for PDPageContentStream looks like:
public PDPageContentStream(PDDocument document, PDPage sourcePage) throws IOException
{
this(document, sourcePage, AppendMode.OVERWRITE, true, false);
}
Problem is AppendMode.OVERWRITE for me using another constructor with parameter PDPageContentStream.AppendMode.APPEND resolved a problem
For me this worked:
PDPageContentStream contentStream =
new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true, false);