java gateway json has extra spaces

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"
}