How to merge .doc files using Apache POI API

Question

i'm trying to merge .doc files , i used this code found in previous stackOverflow post :

        public static void main (String[] args) throws Exception {  
        // POI apparently can't create a document from scratch,  
        // so we need an existing empty dummy document  
        HWPFDocument doc = new HWPFDocument(new FileInputStream("fich1.doc"));  
        Range range = doc.getRange();  


        //I can get the entire Document and insert it in the tmp.doc  
        //However any formatting in my word document is lost.  
        HWPFDocument doc2 = new HWPFDocument(new FileInputStream("fich2.doc"));  
        Range range2 = doc2.getRange();  
        range.insertAfter(range2.text());  

        //I can get the information (text only) for each character run/paragraph or section.  
        //Again any formatting in my word document is lost.  
        HWPFDocument doc3 = new HWPFDocument(new FileInputStream("fich3.doc"));  
        Range range3 = doc3.getRange();  
        for(int i=0;i<range3.numCharacterRuns();i++){  
            CharacterRun run3 = range3.getCharacterRun(i);  
            range.insertAfter(run3.text());  
        }  

        OutputStream out = new FileOutputStream("result.doc");  
        doc.write(out);  
        out.flush();  
        out.close();  
}  

The problem that i'm getting this error :

Your document seemed to be mostly unicode, but the section definition was in bytes! Trying anyway, but things may well go wrong! Your document seemed to be mostly unicode, but the section definition was in bytes! Trying anyway, but things may well go wrong! Your document seemed to be mostly unicode, but the section definition was in bytes! Trying anyway, but things may well go wrong!

Here's the content of the different files :

fich1.doc : Hi all

fich2.doc : Bonjour à tous

fich3.doc : Hallo alles

resullt.doc : Hi allB

Answer 1

This bug is fixed in poi 3.9 jars : used jars

poi-3.9.jar / poi-ooxml-3.9.jar / poi-ooxml-schemas-3.9.jar / poi-scratchpad-3.9.jar