POST entity with a byte array attribute as JSON - jersey-2.0

Question

I'm new with REST and have to make a POST that receive an entity with a nested object that has inside a byte array.
This is my POST:
#POST
#Path("/post-entity")
#Consumes({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
#Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
public Response processEventcallback(ProcessEvent processEvent) {
System.out.println(entity.toString());
return null;
}
I call the POST like this:
Client client = ClientBuilder.newClient();
Entity entity = new Entity ();
entity .setId("645");
entity .setKey("cqp");
entity .setVersion("1.0");
Message msg= new Message();
msg.setContent(Base64.getEncoder().encode("post test".getBytes()));
msg.setId("carl");
entity.setMsg(msg);
WebTarget target = client.target("http://localhost:8080/myRest/webapi/");
Response response = target.path("send" ).request()
.post(Entity.entity(entity, MediaType.APPLICATION_JSON));
When i use xml as media type in the post it's all ok, the problem is when i use (json as in the code before), i get:
javax.ws.rs.ProcessingException: javax/mail/internet/MimeMultipart
...
...
Caused by: java.lang.NoClassDefFoundError: javax/mail/internet/MimeMultipart
if I remove the byte array in message it works just fine

Answer 1

ok, I hope to be more tired than stupid...but as the
"Caused by: java.lang.NoClassDefFoundError: javax/mail/internet/MimeMultipart" suggest, by adding javax.mail to the dependencies all is solved...