WARNING: Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart). Attachment support is disabled.

Solution:

1. download activation.jar http://java.sun.com/javase/technologies/desktop/javabeans/jaf/downloads/index.html or http://www.java2s.com/Code/Jar/GHI/Downloadactivationjar.htm

2. download mail.jar http://java.sun.com/products/javamail/downloads/index.html

3. add these two jar’s to the project

คู่มือการใช้ IP Msg

คู่มื่อการใช้ IP Msg