javax.activation.UnsupportedDataTypeException：无对象DCH for

我得到的错误是,
“javax.mail.MessagingException：IOException同时发送消息;
嵌套异常是：
javax.activation.UnsupportedDataTypeException：无对象DCH for MIME类型multipart / mixed; boundary =“—- = _ Part_0_145238.1392728439484”“我寻找在stackoverflow中给出的解决方案的帮助,但没有一个有帮助.

提前致谢

public void fileCreated(int wd,String rootPath,String name) {
            print("created " + rootPath + " : " + name);

            if (name.contains(".apk"))
            SendEmail(name);
                 else{
                System.out.println("Not the APK file");
        }
    void SendEmail(String strname){
                String Path = "D:/POC/Email/apk folder/"+strname;
                System.out.println("Path->" + Path);
                Properties props = new Properties();
                props.put("mail.smtp.host","173.194.78.108");
                props.put("mail.smtp.socketFactory.port","465");
                props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
                props.put("mail.smtp.auth","true");
                props.put("mail.smtp.port","465");
                System.out.println("Properties has been set properly");

                Session session = Session.getDefaultInstance(props,new javax.mail.Authenticator(){
                            protected PasswordAuthentication getPasswordAuthentication(){
                                return new PasswordAuthentication("SenderEmailID@gmail.com","senderPassword");
                            }
                        }
                    );
                System.out.println("Session Created successfully");
                try{
                    Message message = new MimeMessage(session); 
                    message.setFrom(new InternetAddress("SenderEmailID@gmail.com"));
                    message.setRecipients(Message.RecipientType.TO,InternetAddress.parse("ToReceiverEmailID@gmail.com"));
                    message.setSubject("Android : " + strname);

                    MimeBodyPart msgbody = new MimeBodyPart();
                    msgbody.setText("This is the message content which is sent using JAVA MAIL 1.4.5");
                    Multipart mulpart = new MimeMultipart();
                    mulpart.addBodyPart(msgbody);

                    //Attachement Starts here.
                    msgbody = new MimeBodyPart();
                    javax.activation.DataSource source = new FileDataSource(Path);
                    msgbody.setDataHandler(new DataHandler(source));
                    msgbody.setFileName(strname);
                    message.setContent(mulpart);

                    System.out.println("Attached the message going to start transporting the mail");

                    //If i've the code before sending the email is getting sent but without attachment. 
                    //Thread.currentThread().setContextClassLoader( getClass().getClassLoader() );

                    Transport.send(message);
                    System.out.println("Mail Sent successfully");

                }catch(MessagingException msg){
                    msg.printStackTrace();
                    }
                catch(Exception e){
                    e.printStackTrace();}
    }