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Replacing text in XWPFParagraph without changing format of the docx file

I am developing font converter app which will convert Unicode font text to Krutidev/Shree Lipi (Marathi/Hindi) font text. In the original docx file there are formatted words (i.e. Color, Font, size of the text, Hyperlinks..etc. ).
I want to keep format of the final docx same as the original docx after converting words from Unicode to another font.
PFA.
Here is my Code
try {
fileInputStream = new FileInputStream("StartDoc.docx");
document = new XWPFDocument(fileInputStream);
XWPFWordExtractor extractor = new XWPFWordExtractor(document);
List<XWPFParagraph> paragraph = document.getParagraphs();
Converter data = new Converter() ;
for(XWPFParagraph p :document.getParagraphs())
{
for(XWPFRun r :p.getRuns())
{
String string2 = r.getText(0);
data.uniToShree(string2);
r.setText(string2,0);
}
}
//Write the Document in file system
FileOutputStream out = new FileOutputStream(new File("Output.docx");
document.write(out);
out.close();
System.out.println("Output.docx written successully");
}
catch (IOException e) {
System.out.println("We had an error while reading the Word Doc");
}

Thank you for ask-an-answer.
I have worked using POI some years ago, but over excel-workbooks, but still I’ll try to help you reach the root cause of your error.
The Java compiler is smart enough to suggest good debugging information in itself!
A good first step to disambiguate the error is to not overwrite the exception message provided to you via the compiler complain.
Try printing the results of e.getLocalizedMessage()or e.getMessage() and see what you get.
Getting the stack trace using printStackTrace method is also useful oftentimes to pinpoint where your error lies!
Share your findings from the above method calls to further help you help debug the issue.
[EDIT 1:]
So it seems, you are able to process the file just right with respect to the font conversion of the data, but you are not able to reconstruct the formatting of the original data in the converted data file.
(thus, "We had an error while reading the Word Doc", is a lie getting printed ;) )
Now, there are 2 elements to a Word document:
Content
Structure or Schema
You are able to convert the data as you are working only on the content of your respective doc files.
In order to be able to retain the formatting of the contents, your solution needs to be aware of the formatting of the doc files as well and take care of that.
MS Word which defined the doc files and their extension (.docx) follows a particular set of schemas that define the rules of formatting. These schemas are defined in Microsoft's XML Namespace packages[1].
You can obtain the XML(HTML) format of the doc-file you want quite easily (see steps in [1] or code in link [2]) and even apply different schemas or possibly your own schema definitions based on the definitions provided by MS's namespaces, either programmatically, for which you need to get versed with XML, XSL and XSLT concepts (w3schools[3] is a good starting point) but this method is no less complex than writing your own version of MS-Word; or using MS-Word's inbuilt tools as shown in [1].
[1]. https://www.microsoftpressstore.com/articles/article.aspx?p=2231769&seqNum=4#:~:text=During%20conversion%2C%20Word%20tags%20the,you%20can%20an%20HTML%20file.
[2]. https://svn.apache.org/repos/asf/poi/trunk/src/scratchpad/testcases/org/apache/poi/hwpf/converter/TestWordToHtmlConverter.java
[3]. https://www.w3schools.com/xml/
My answer provides you with a cursory overview of how to achieve what you want to, but depending on your inclination and time availability, you may want to use your discretion before you decide to head onto one path than the other.
Hope it helps!

Get Row and Col for embedded Object with POI

i'm currently working with Excel files (*.xlsm) and Apache POI , and i have been cracking my head over a task.
I receive some excel files that have PDFs embedded in it and i want to extract them and rename them based on the row and column they are in.
This seems weird as i know the embedded objects are represented as images ,they can occupy more than one cell and technically they are not "In" the cell.
The following code snippet lets me extract the embedded PDFs but they are named OleObject[1..2..3.etc..] wich doesnt give me any clue.
inStream = new FileInputStream(file);
XSSFWorkbook workbook = new XSSFWorkbook(inStream);
for (PackagePart pPart : workbook.getAllEmbedds()) {
String contentType = pPart.getContentType();
if (contentType.equals("application/vnd.openxmlformats-officedocument.oleObject")){
POIFSFileSystem fs = new POIFSFileSystem(pPart.getInputStream());
TikaInputStream stream = TikaInputStream.get(fs.createDocumentInputStream("CONTENTS"));
byte[] bytes = IOUtil.toByteArray(stream);
stream.close();
OutputStream outStream = new FileOutputStream(new File(ROOT_DIRECTORY.getAbsolutePath()+"\\PDF"+i+".pdf"));
IOUtil.copy(bytes, outStream);
outStream.close();
}}
I wanted to know if org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorksheet will let me see the xml code of the excell sheet and maybe eith taht i can get the info i need. Like this.
<oleObjects><mc:AlternateContent xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"><mc:Choice Requires="x14"><oleObject progId="Acrobat Document" dvAspect="DVASPECT_ICON" shapeId="1028" r:id="rId4"><objectPr defaultSize="0" r:id="rId5"><anchor moveWithCells="1"><from><xdr:col>8</xdr:col><xdr:colOff>0</xdr:colOff><xdr:row>11</xdr:row><xdr:rowOff>0</xdr:rowOff></from><to><xdr:col>8</xdr:col><xdr:colOff>1143000</xdr:colOff><xdr:row>13</xdr:row><xdr:rowOff>171450</xdr:rowOff></to></anchor></objectPr></oleObject></mc:Choice><mc:Fallback><oleObject progId="Acrobat Document" dvAspect="DVASPECT_ICON" shapeId="1028" r:id="rId4"/></mc:Fallback></mc:AlternateContent></oleObjects>
--
<objectPr defaultSize="0" r:id="rId5"><anchor moveWithCells="1"><from><xdr:col>8</xdr:col><xdr:colOff>0</xdr:colOff><xdr:row>11</xdr:row><xdr:rowOff>0</xdr:rowOff></from><to><xdr:col>8</xdr:col><xdr:colOff>1143000</xdr:colOff><xdr:row>13</xdr:row><xdr:rowOff>171450</xdr:rowOff></to></anchor></objectPr>
I guess using the anchor information would be possible but im just unable to find how to get it.
Hope this information makes things clear on what im trying to do .
Thanks in advance.

I've looked at the source code for the current poi-ooxml-schemas sources jars which you can locate here: http://repo1.maven.org/maven2/org/apache/poi/ooxml-schemas/1.3/
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorksheet extends org.apache.xmlbeans.XmlObject which can give you the XML as a string using the inherited .toString() method. Or you can quickly access the list of OLE objects in the worksheet by calling getOleObjects() on your CTWorksheet object.
/**
* Gets the "oleObjects" element
*/
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTOleObjects getOleObjects();
CTOleObjects itself extends org.apache.xmlbeans.XmlObject and again you can get the XML using toString() for parsing, or get a list of org.openxmlformats.schemas.spreadsheetml.x2006.main.CTOleObject OLE objects for iteration using CTOleObjects.getOleObjectList().
/**
* Gets a List of "oleObject" elements
*/
java.util.List<org.openxmlformats.schemas.spreadsheetml.x2006.main.CTOleObject> getOleObjectList();
CTOleObject doesn't seem to have getter methods to get the and child XML elements to allow you to determine the columns, so I think you would need to do some XML parsing, or string searching to get this info if it is contained in the string XML representation.
Hope this helps.

Add text in MS Word doc using apache POI

I have been trying to edit different types of documents using Apache POI. The script should handle both extensions .doc and .docx. I could successfully edit the .docx file using XWPF api and the required text was added at the end of the docx file.
For editing .doc files(which include header, footer and a few paragraphs), following script is used, which use HWPFDocument.
FileInputStream fis = new FileInputStream(args[0]);
POIFSFileSystem fs = new POIFSFileSystem(fis);
HWPFDocument doc = new HWPFDocument(fs);
Range range = doc.getRange();
CharacterRun run = range.insertAfter("FROM SEHWAGGG A FOUUURRRRRR");
run.setBold(true);
run.setItalic(true);
The script works fine with normal documents which does not have header and footer. But seems that the issue appears with complex documents. It insert text, but in between the paragraphs (and at the beginning using insertBefore()). There are no text replacements required, just have to put the text at the end of the document. I searched similar scripts but most of them handle text replacement.
How can I add the text at the end, after all paragraphs?

I've tested It with the following document:
At first (with your original code) it completely destroyed the document:
By changing the following line, the insert works fine for me:
// Old
Range range = doc.getEndnoteRange();
// New
Range range = doc.getEndnoteRange();

I'm afraid you are out of luck with HWPF with the current state of the project.
I created a custom HWPF library for one of our clients, but the changes are not public. The changes were huge, so you can't spend - say - a week and assume that things will be fixed. You might get away with the current public HWPF when only some text needs to be replaced without changing the string length ("abc" -> "123" or "a " -> "1234").

How to create or update table of contents in a word file?

I can read or write word document in Java using Apache POI or docx4j. But I cant find any references to create or update table of contents in a Word file. Is there any other API can support TOC in Java? Or, is it possible in Apache POI or docx4j to have options to create or update TOC?

To create table of contents with apache poi you can just use:
doc.createTOC();
But it seems a bit buggy. The TOC is created but the (MS Office pro 2010) does not seem to recognize it as TOC and the references are not working.
Or you can call:
doc.enforceUpdateFields();
This will create a popup in word document with: "This document contains fields that may refer to other files. Do you want to update the fields in this document?", which looks a bit dodgy if you are opening a new doc :)

There's a cleaner way for this too.
You just need to open a empty docx which will act as a template. Add some sample text into it with the style that you want to include and then this piece of code will work.
XWPFDocument document = new XWPFDocument(new FileInputStream("template.docx");
paragraph = document.createParagraph();
lastParagraph.setStyle("Heading1");

RTF Line count in Java

Kindly let me know any API to calculate the line count for RTF document.
Apache POI or Aspose works for document, but its not able to find line count for RTF.
Thanks.

Java already has a built-in RTF-Parser: RTFEditorKit.
Take a look at its read method.
For example:
test.rtf file contents
hello
stackoverflow
users
So, it has 3 lines separated by \n.
Code:
FileInputStream stream = new FileInputStream("test.rtf");
RTFEditorKit kit = new RTFEditorKit();
Document doc = kit.createDefaultDocument();
kit.read(stream, doc, 0);
String plainText = doc.getText(0, doc.getLength());
System.out.println(plainText.split("\\n").length);
Output = 3

You can use Aspose.Words for Java to get the number of lines of an RTF document. Please do the following:
Read RTF file using document class
Get BuiltInDocumentProperties object using getBuiltInDocumentProperties method
Now, get number of lines using getLines property of BuiltInDocumentProperties object
I hope this helps. Please note that I work as developer evangelist at Aspose. If you need any help with Aspose, do let me know.