Jackson-Databind: Compilation issue for the version greater than 2.9.10

Question

I am using the jackson-databind 2.9.10. I tried to upgrade the version.

I tried many versions. But, trying with the latest now which is 2.12.2

With all the versions greater than 2.9.10, I am getting compilation issue on the below code.

    Map<String, List<Map<String, Object>>> result =
    objectMapper.readValue(inputResponse, new TypeReference<Map<String, Object>>() {
    });

Issue: incompatible types: inference variable T has incompatible bounds

Input response is on the string format of below json:

{
"config": [{
    "key1": "value1",
    "key2": "value2",
    "key3": [{
        "key3.1": "value3.1",
        "key3.2": "value3.2",
        "key3.3": [{
            "key3.3.1": "value3.3.1",
            "key3.3.2": "value3.3.2"
        }]
    }]
}]}

Answer 1

From jackson mapper 2.10.0 onwards, bounds of the TypeReference have to match the type of the response variable.

For more info: https://github.com/FasterXML/jackson-databind/pull/2196