Can not deserialize instance of java.util.ArrayList out of START_OBJECT token

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The problem is the JSON – this cannot, by default, be deserialized into a Collection because it’s not actually a JSON Array – that would look like this: 

[
    {
        "name": "Test order1",
        "detail": "ahk ks"
    },
    {
        "name": "Test order2",
        "detail": "Fisteku"
    }
]

Since you’re not controlling the exact process of deserialization (RestEasy does) – a first option would be to simply inject the JSON as a String and then take control of the deserialization process: 

Collection<COrder> readValues = new ObjectMapper().readValue(
    jsonAsString, new TypeReference<Collection<COrder>>() { }
);

You would loose a bit of the convenience of not having to do that yourself, but you would easily sort out the problem.

Another option – if you cannot change the JSON – would be to construct a wrapper to fit the structure of your JSON input – and use that instead of Collection<COrder>.

Hope this helps.

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