emailsender.java

// TODO make this call async, using another threadpool
    public void sendEmail(final String sender, final String to, final String subject,
            final String content, final String contentType) {
    
        // null checks
        
        connectToSmtpTransport();
        
        try {
            //TODO from string to internet address
            final InternetAddress senderAddress = emailContactToInternetAddress(sender);
            
            //TODO from string to internet address
            final InternetAddress toAddress = emailContactToInternetAddress(to);
            
            //session is a field
            final MimeMessage message = new MimeMessage(this.session);
            message.setFrom(senderAddress);
            final Address[] senders = new Address[] { senderAddress };
            message.setReplyTo(senders);
            message.addRecipient(Message.RecipientType.TO, toAddress);
            message.setSubject(subject);
            message.setContent(content, contentType);
            
            //smtpTransport is a field
            this.smtpTransport.sendMessage(message, message.getAllRecipients());
            
        } catch (MessagingException mex) {
            throw new RuntimeException(mex);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        } finally {
            closeQuietlySmtpTransport();
        }
        
        LOGGER.info("message sent successfully to '" + to + "'");
        
    }
    
    private void connectToSmtpTransport() {
    
        try {
            this.smtpTransport.connect(this.smtpHost, this.port, this.user, this.password);
        } catch (NoSuchProviderException e) {
            throw new RuntimeException(e);
        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
    
    private void closeQuietlySmtpTransport() {
    
        try {
            this.smtpTransport.close();
        } catch (MessagingException e) {
            LOGGER.warn("exception closing smtp transport: " + e.getMessage());
        }
    }