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

In order to fix the javax.activation.DataHandler issue you must add the JavaBeans Activation Framework activation.jar in your classpath.

In order to fix the javax.mail.internet.mimeMultipart issue you must add the Java Mail API mail.jar in your classpath.

The warning messages printed in your console shows that the above jars are not in the classpath.