I see in v3 reference in mailJet’s site http://dev.mailjet.com/email-api/v3/newsletter-send/ there is the following example:
curl -s -X POST --user "$MJ_APIKEY_PUBLIC:$MJ_APIKEY_PRIVATE" https://api.mailjet.com/v3/REST/newsletter/:id/send
but I can’t find in all your code any example how it should be done with mailjet Java API https://github.com/mailjet/mailjet-apiv3-java?
Answer
According to the response of mailJet’s support their Java Wrapper is not completed and majority of REST API they still don’t cover. So if you are going to use mailjet-apiv3-java library you should be ready to implement by yourself some REST commands.