Error Reading xml file

Question

hello guys , i made a java program using jni to call a Com file , this com file will return an xml string , i am supposed to read that xml string and parse it
i made my code like the following
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
          DocumentBuilder builder = factory.newDocumentBuilder();
          Document currentdocument = builder.parse(new File("simple2.txt"));
          //normalize the string representation
          currentdocument.getDocumentElement().normalize();
          String RootName = currentdocument.getElementById("IdValue").getNodeValue();
          jTextArea1.append(RootName);
now trying to parse that it gives me an enormous error which is
Invalid byte 1 of 1-byte UTF-8 sequence.
what is the problem

Answer 1

Using my crystal ball, it seems as if the .txt file created by the Com file is not UTF8 as you have specified or let default.