zabbix java gateway includes extra spaces in it's responses. other components do not do that. this is not consistent and also increases the amount of traffic.
for example :

{ "response" : "failed", "error" : "java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: non-JRMP server at remote endpoint]" }

other components would format the beginning of the above response as :

{"response":"failed","error" :

it is also not consistent across different java gateway messages. for example, it also returns :

{
"data": [

{"value": "1348360"}

],
"response": "success"
}