Created question in FIWARE Q/A platform on 10-12-2018 at 18:12
Please, ANSWER this question AT https://stackoverflow.com/questions/53710837/conflict-error-when-obtaining-attributes-in-fiware-orion-context-broker

Question:
Conflict Error when obtaining attributes in FIWARE Orion Context Broker

Description:
I cannot get any entity attribute when I have context provider registered. I constantly get the same 409 conflict error. How can I prevent having two objects with the same id and merge them into one?

SETUP

I have whole Orion Context Broker all setup and running after following this commands:

docker pull mongo:3.6
docker pull fiware/orion:2.0.0
docker network create fiware_default

docker run -d --name=mongo-db --network=fiware_default \
--expose=27017 mongo:3.6 --bind_ip_all --smallfiles
docker run -d --name fiware-orion -h orion --network=fiware_default \
-p 1026:1026 fiware/orion:2.0.0 -dbhost mongo-db

ENTITIES

I have one Car entity:

{
"id": "urn:ngsi-ld:Car:001",
"type": "Car",
"brandName": {
"type": "Property",
"value": "Mercedes",
"metadata": {}
},
"location": {
"type": "geo:json",
"value":

,
"metadata": {}
},
"name": {
"type": "Text",
"value": "MyCar",
"metadata": {}
}
}

Moreover I also registered my Context Provider:

{
"description": "Temperature",
"dataProvided": {
"entities": [

],
"attrs": [
"temperature"
]
},
"provider": {
"http":

,
"legacyForwarding": true
}
}

CONTEXT PROVIDER

I exposed locally my Context Provider (exposed by my SpringBoot application written in Java 10) at http://192.168.xxx.xxx:8080/temperature/1/queryContext. The JSON data (returned in html body) is in NSGI v1 format and looks like that:

{
"contextResponses": [
{
"contextElement": {
"attributes": [

],
"id": "urn:ngsi-ld:Car:001",
"isPattern": "false",
"type": "Car"
},
"statusCode":

}
]
}

PROBLEM

When I try to get attribute (location) without registered context, it works fine for me, but after context registration it fails (I get 409 Conflict Error).

On the other hand, I can remove entity by id and then I can get temperature for not existing object.

When I have both entity and context provider for this entity and I make this query:

curl GET 'http://localhost:1026/v2/entities?type=Car&options=keyValues'

I receive list of objects with the same ids:

[

,

]

What should I do to prevent this id conflict? How to prevent having two objects with the same id when registering context provider?