Hi,

It is not possible to send email in Karaf 4.2 with javax.mail API. When an 
email is sent, this exception is raised :

javax.mail.MessagingException: IOException while sending message;
  nested exception is:
     javax.activation.UnsupportedDataTypeException: no object DCH for MIME type 
multipart/mixed;

I've found that it is because the Activation Framework (javax.activation) is 
not OSGI compliant. In the previous Karaf version (4.1) a servicemix 
implementation of the Activation Framework was included but it is not the case 
anymore.

The solution to have a working Activation Framework is to remove 
javax.activation references in jre.properties and to install the bundle 
org.apache.servicemix.specs/org.apache.servicemix.specs.activation-api-1.1/2.9.0.

For the future Karaf 4.2.2 can you please :

-          Remove javax.activation from jre.properties

-          Remove activation-1.1.1.jar from directory lib/boot

-          Let the user install 
org.apache.servicemix.specs/org.apache.servicemix.specs.activation-api-1.1/2.9.0
 if needed

Regards,
--
Nicolas Dutertry
Sopra HR Software - http://www.soprahr.com/

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