javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed; boundary

Question

Currently I\'m inline of writing a code that will be listening to a directory. when the directory is updated with .apk file, I\'ll send a mail with this .apk file to a gmail

Answer 1

If it's a android project, it's highly possible the proguard stripped out unused classes by mistake, please add the following lines in the proguard file to fix the problem without modifying the code directly:

-keep class com.sun.mail.handlers.**
-dontwarn com.sun.mail.handlers.handler_base