*** It is a bug. ***

Sun inconsistently returns Session when you're inside their Glassfish EE
container, and a MailConfiguration if you're inside a non-compliant portion of
their Glassfish EE container or a 3rd party container. Here's a work around:

// Outside the EJB container, MailSession lookups return a
MailConfiguration rather // than a mail Session like one would expect.

context = new InitialContext(); Object object = context.lookup("mail/MyMailSession"); Session session = null;

if (object instanceof MailConfiguration) { MailConfiguration configuration = (MailConfiguration) object; session = Session.getInstance(configuration.getMailProperties()); } else if (object instanceof Session) { session = (Session) object; }

// Compose the e-mail message.

Message message = new MimeMessage(session); [Message sent by forum member 'frenchdrip' (frenchdrip)]

http://forums.java.net/jive/thread.jspa?messageID=263855