Cannot send SMTP mail from AWS EC2

I am trying to send an email using SMTP. It works fine in my local. But it does not work when i built it on AWS EC2 server.

This is my code to config and send email!
Any idea for me?

try{

     Properties props = System.getProperties();
     props.put("mail.smtp.starttls.enable",true);
     props.put("mail.smtp.host","smtp.gmail.com");
     props.put("mail.smtp.user","test@gmail.com");
     props.put("mail.smtp.password","testpassword");
     props.put("mail.smtp.port","587");
     props.put("mail.smtp.auth",true);
     props.put("mail.smtp.ssl.trust", "*");

     String[] to = {toEmail};

     Session session = Session.getDefaultInstance(props, null);
     MimeMessage message = new MimeMessage(session);
     message.setFrom(new InternetAddress("test@gmail.com"));
     InternetAddress[] toAddress = new InternetAddress[to.length];

        // To get the array of addresses
        for( int i=0; i < to.length; i++ ) { // changed from a while loop
            toAddress[i] = new InternetAddress(to[i]);
        }
        System.out.println("EMAIL TO:"+toEmail);

        for( int i=0; i < toAddress.length; i++) { // changed from a while loop
            message.addRecipient(Message.RecipientType.TO, toAddress[i]);
        }
        message.setSubject(subject);
        message.setText(content);
        Transport transport = session.getTransport("smtp");
        transport.connect("smtp.gmail.com","test@gmail.com","testpassword");
        transport.sendMessage(message, message.getAllRecipients());
        transport.close();
  }
  catch(Exception ex){
         log.debug("send Email failed", ex);
  }