Description of problem:
If you send GetObject command using JSON to the KieServer, the type information is lost.

The type information is present when using XStream for example, 

Version-Release number of selected component (if applicable):

BRMS 6.2.1

How reproducible:

always
Steps to Reproduce:
1. Deploy some KJAR onto the KieServer
2. Insert some custom object into the KieSesession and call GetObject command to retrieve it
3. If you use JSON marshaller, the type information for this Custom Object is lost


Sample client code for interacting with the KieServer
https://gist.github.com/agiertli/d8ee2ab934cf1987097b

The server response of the above call is this:

{
  "results" : [ {
    "key" : "insert-identifier",
    "value" : {"org.Person":{
  "name" : "anton"
}}
  }, {
    "key" : "get-obj-response",
    "value" : [ {
  "name" : "anton"
} ]
  }, {
    "key" : "fire-identifier",
    "value" : 0
  } ],
  "facts" : [ {
    "key" : "insert-identifier",
    "value" : {"org.drools.core.common.DefaultFactHandle":{
  "external-form" : "0:1:823286421:823286421:1:DEFAULT:NON_TRAIT:org.Person"
}}
  } ]
}

The object inserted is of type org.Person - as you can see, under "get-obj-response" this type is simply not listed.

The response could look like this:

"results" : [ {
    "key" : "responseObjects",
    "value" : [
{"org.Person":{
  "name" : "anton",...
}},
...

Actual results:
 Type information about the custom object is lost, when sending GetObject command to KieServer using JSON

Expected results:

 Type information about the custom object is lost, when sending GetObject command to KieServer using JSON
Additional info: