java - RTFEditorKit read()/write() bug? -

consider following code:

import java.io.bytearrayinputstream; import java.io.bytearrayoutputstream; import java.io.ioexception; import javax.swing.jtextpane; import javax.swing.text.badlocationexception; import javax.swing.text.defaultstyleddocument; import javax.swing.text.styleddocument; import javax.swing.text.rtf.rtfeditorkit;   public class testrtf  {     public static void main(string args[]) throws badlocationexception, ioexception {         new testrtf();     }      public testrtf() throws badlocationexception, ioexception {         styleddocument doc = new defaultstyleddocument();         jtextpane tp = new jtextpane(doc);         doc.insertstring(0, "this test", null);         rtfeditorkit kit = new rtfeditorkit();         for(int i=0; i<4; i++) {             bytearrayoutputstream out = new bytearrayoutputstream();             kit.write(out, doc, 0, doc.getlength());             string s = out.tostring();             system.out.println(s);             system.out.println("-------------------");             doc.remove(0, doc.getlength());             kit.read(new bytearrayinputstream(s.getbytes()), doc, 0);         }             } } 

i expect print out same string 4 times, instead in cycle of reading textpane, , replacing content read results in additional paragraph being created:

{\rtf1\ansi {\fonttbl\f0\fnil monospaced;\f1\fnil dialog;} {\colortbl\red0\green0\blue0;\red51\green51\blue51;}  \f1\fs24\i0\b0\cf1 test\par }  ------------------- {\rtf1\ansi {\fonttbl\f0\fnil monospaced;\f1\fnil dialog;} {\colortbl\red0\green0\blue0;\red51\green51\blue51;}  \li0\ri0\fi0\f1\fs24\i0\b0\ul0\cf1 test\par \li0\ri0\fi0\ul0\par }  ------------------- {\rtf1\ansi {\fonttbl\f0\fnil monospaced;\f1\fnil dialog;} {\colortbl\red0\green0\blue0;\red51\green51\blue51;}  \li0\ri0\fi0\f1\fs24\i0\b0\ul0\cf1 test\par \par \ul0\par }  ------------------- {\rtf1\ansi {\fonttbl\f0\fnil monospaced;\f1\fnil dialog;} {\colortbl\red0\green0\blue0;\red51\green51\blue51;}  \li0\ri0\fi0\f1\fs24\i0\b0\ul0\cf1 test\par \par \par \ul0\par }  ------------------- 

is bug in rtfeditorkit, or doing wrong?

i it's bug in rtfeditorkit.

actually empty defaultstyleddocument (which used in kit internlly) till has 1 paragraph (with 1 \n) in end. looks kit don't care paragraph creates new ones every time rather using existing.

you can try the alternative rtf editor kit supports more things