i'm trying to send mail in this way:
Properties props = new Properties();
props.setProperty("mail.transport.protocol", "smtp");
props.setProperty("mail.host", "out.alice.it");
props.setProperty("mail.user", "mymail@domain.it");
props.setProperty("mail.password", "*****");
Session mailSession = Session.getDefaultInstance(props, null);
Transport transport = mailSession.getTransport();
MimeMessage message = new MimeMessage(mailSession);
message.setFrom(new InternetAddress("Host", "Name"));
On the row Transport transport...
i retrieve this error:
javax.mail.NoSuchProviderException: Invalid protocol: null
at javax.mail.Session.getProvider(Session.java:440)
at javax.mail.Session.getTransport(Session.java:659)
at javax.mail.Session.getTransport(Session.java:640)
at javax.mail.Session.getTransport(Session.java:626)
at Mail.sendMail(Mail.java:151)
How can i resolve? Can someone help me? Thanks!! :)
EDIT:
If i create a main and launch that method to send mail, it works good! My problem borns after i read mail into mail folder:
Properties properties = System.getProperties();
properties.setProperty("mail.store.protocol", "imap");
Session session = Session.getDefaultInstance(properties, null);
Store store = session.getStore("pop3");
store.connect("pop3.domain.it", "mail@domain.it", "****");
Folder inbox = store.getFolder("inbox");
FlagTerm ft = new FlagTerm(new Flags(Flags.Flag.SEEN), false);
inbox.open(Folder.READ_ONLY);
Message messages[] = inbox.search(ft);
for(Message message:messages) {
if(message.getFrom()[0].toString().equals("aMail")){
sendMail(message.getFrom()[0].toString());//Error!
}
}
I Thought the exception borns cause i've opened store to get inbox mail so i edit in this way:
ArrayList<String> reply = new ArrayList<String();
for(Message message:messages) {
if(message.getFrom()[0].toString().equals("aMail")){
reply.add(message.getFrom()[0].toString());
}
}
store.close();
for(String mail : reply){
sendMail(mail); // ERROR AGAIN!
}
very strange....
SOLVED IN THIS WAY:
i modified this row
Session mailSession = Session.getDefaultInstance(props, null);
to
Session mailSession = Session.getInstance(props);
you might try another way:
Properties props = new Properties();
props.setProperty("mail.transport.protocol", "smtp");
props.setProperty("mail.smtp.host", "out.alice.it");
props.setProperty("mail.smtp.auth", "true");
final PasswordAuthentication auth = new PasswordAuthentication(smtpUser, stmpPassword);
Session mailSession = Session.getDefaultInstance(props, new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() { return auth; }
});
MimeMessage message = ....;
// compose the message
Transport.send(message);
I was getting this same error, and my problem was I forgot to include:
props.put("mail.transport.protocol", "smtp");
来源:https://stackoverflow.com/questions/11265755/how-to-correct-invalid-protocol-null-sending-mail-using-javax-mail