Error while doing a post using nntp provider

When I try to post a new article using GNU JavaMail release 1.0, I got the following error

DEBUG: getProvider(): javax.mail.Provider[TRANSPORT,nntp-post,gnu.mail.providers.nntp.NNTPTransport,[email protected]]
nntp: <200 NNTP-Server Classic Hamster Vr. 2.0 (Build 2.0.0.1) (post ok) says: Hi!
nntp: >AUTHINFO USER yllee
nntp: <381 More authentication information required
nntp: >AUTHINFO PASS password
nntp: <281 Authentication accepted
nntp: >POST
nntp: <340 send article to be posted. End with <CR-LF>.<CR-LF>
javax.mail.MessagingException: ISO8859_1
;
  nested exception is: 
	java.io.UnsupportedEncodingException: ISO8859_1

	at gnu.mail.providers.nntp.NNTPTransport.sendMessage(NNTPTransport.java:206)
	at TestPosting2.main(TestPosting2.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)
nested exception is:
java.io.UnsupportedEncodingException: ISO8859_1

	at sun.io.Converters.getConverterClass(Converters.java:215)
	at sun.io.Converters.newConverter(Converters.java:248)
	at sun.io.CharToByteConverter.getConverter(CharToByteConverter.java:64)
	at sun.nio.cs.StreamEncoder$ConverterSE.<init>(StreamEncoder.java:189)
	at sun.nio.cs.StreamEncoder$ConverterSE.<init>(StreamEncoder.java:172)
	at sun.nio.cs.StreamEncoder.forOutputStreamWriter(StreamEncoder.java:72)
	at java.io.OutputStreamWriter.<init>(OutputStreamWriter.java:82)
	at gnu.mail.handler.Text.writeTo(Text.java:141)
	at javax.activation.ObjectDataContentHandler.writeTo(ObjectDataContentHandler.java:155)
	at javax.activation.DataHandler.writeTo(DataHandler.java:280)
	at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1697)
	at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1639)
	at gnu.mail.providers.nntp.NNTPTransport.sendMessage(NNTPTransport.java:195)
	at TestPosting2.main(TestPosting2.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)
java.io.UnsupportedEncodingException: ISO8859_1

	at sun.io.Converters.getConverterClass(Converters.java:215)
	at sun.io.Converters.newConverter(Converters.java:248)
	at sun.io.CharToByteConverter.getConverter(CharToByteConverter.java:64)
	at sun.nio.cs.StreamEncoder$ConverterSE.<init>(StreamEncoder.java:189)
	at sun.nio.cs.StreamEncoder$ConverterSE.<init>(StreamEncoder.java:172)
	at sun.nio.cs.StreamEncoder.forOutputStreamWriter(StreamEncoder.java:72)
	at java.io.OutputStreamWriter.<init>(OutputStreamWriter.java:82)
	at gnu.mail.handler.Text.writeTo(Text.java:141)
	at javax.activation.ObjectDataContentHandler.writeTo(ObjectDataContentHandler.java:155)
	at javax.activation.DataHandler.writeTo(DataHandler.java:280)
	at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1697)
	at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1639)
	at gnu.mail.providers.nntp.NNTPTransport.sendMessage(NNTPTransport.java:195)
	at TestPosting2.main(TestPosting2.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)

Process finished with exit code 0

Below is the sample code

        try {
            Properties props = new Properties();
            Session session = Session.getDefaultInstance(props);
            session.setDebug(true);

            // create message
            javax.mail.internet.MimeMessage message =
                    new javax.mail.internet.MimeMessage(session);
            message.setFrom(new javax.mail.internet.InternetAddress("[email protected]"));
            Address[] recipients = {new NewsAddress("test")};
            message.setRecipients(MimeMessage.RecipientType.NEWSGROUPS,
                    recipients);
            message.setSubject("Test");
            message.setText("This is a test.", "iso-8859-1");
            URLName url = new URLName("nntp-post://yllee:password@localhost");
            // get transport

            Transport transport = session.getTransport(url);
            transport.connect();
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        } catch (MessagingException e) {
            e.printStackTrace();
            Exception e2 = e.getNextException();
            if (e2 != null) {
                e2.printStackTrace();
            }
        }

Thank you.