File file =  new  File("402.xml");

        FileOutputStream stream =  new  FileOutputStream(file, true);

         while  (true) {
            Thread.sleep( 1000 );
            System.out.println("File locked...");
            stream.write('h');
        }
    }

 try  {
                    FileOutputStream outStream =  new  FileOutputStream( new  File("402.xml"), true);
                    outStream.close();
                     return ;
                }  catch  (Exception ex) {
...
                }
...