Problem with Java Mail : No provider for smtp
- by user359198
Hello all.
I am using JavaMail to do a simple application that sends an email when it finds some files in a directory. I managed to get it worked from Eclipse. I Run the application and it sent the email with no errors.
But, when I created the jar, and executed it, it fails in the email sending part.
It gives this exception.
javax.mail.NoSuchProviderException: No provider for smtp
at javax.mail.Session.getProvider(Session.java:460)
at javax.mail.Session.getTransport(Session.java:655)
at javax.mail.Session.getTransport(Session.java:636)
at main.java.util.MailManager.sendMail(MailManager.java:69)
at main.java.DownloadsMail.composeAndSendMail(DownloadsMail.java:16)
at main.java.DownloadsController.checkDownloads(DownloadsController.java:51)
at main.java.MainDownloadsController.run(MainDownloadsController.java:26)
at java.lang.Thread.run(Unknown Source)
I am using the library in this method:
public static boolean sendMail(String subject, String text){
noExceptionsThrown = true;
try {
loadProperties();
} catch (IOException e1) {
System.out.println("Problem encountered while loading properties");
e1.printStackTrace();
noExceptionsThrown = false;
}
Properties mailProps = new Properties();
String host = "mail.smtp.host";
mailProps.setProperty(host, connectionProps.getProperty(host));
String tls = "mail.smtp.starttls.enable";
mailProps.setProperty(tls, connectionProps.getProperty(tls));
String port = "mail.smtp.port";
mailProps.setProperty(port, connectionProps.getProperty(port));
String user = "mail.smtp.user";
mailProps.setProperty(user, connectionProps.getProperty(user));
String auth = "mail.smtp.auth";
mailProps.setProperty(auth, connectionProps.getProperty(auth));
Session session = Session.getDefaultInstance(mailProps);
//session.setDebug(true);
MimeMessage message = new MimeMessage(session);
try {
message.setFrom(new InternetAddress(messageProps.getProperty("from")));
message.addRecipient(Message.RecipientType.TO, new InternetAddress(
messageProps.getProperty("to")));
message.setSubject(subject);
message.setText(text);
Transport t = session.getTransport("smtp");
try {
t.connect(connectionProps.getProperty("user"), passwordProps
.getProperty("password"));
t.sendMessage(message, message.getAllRecipients());
} catch (Exception e) {
System.out.println("Error encountered while sending the email");
e.printStackTrace();
noExceptionsThrown = false;
} finally {
t.close();
}
}
catch (Exception e) {
System.out.println("Error encountered while creating the message");
e.printStackTrace();
noExceptionsThrown = false;
}
return noExceptionsThrown;
}
I am loading these values from properties files.
mail.smtp.host=smtp.gmail.com
mail.smtp.starttls.enable=true
mail.smtp.port=587
mail.smtp.auth=true
I have tried to change the host by ssl://smtp.gmail.com, the port by 465 (just for trying something different), but it doesn't work either. Anyway, if it works fine from Eclipse with the original parameters, I guess that the values are correct, but the problem is creating the jar. I don't know very much about the possible results or changes when creating a jar.
Could the JavaMail libraries someway go wrong when the jar is created?
Do you have any ideas?
Thank you very much for your help.
