How to detect trailing garbage using Jackson ObjectMapper

Question

Say I have a class

class A {
    public int x;
}

Then a valid json can be parsed as follows:

ObjectMapper mapper = new Obje         


        

Answer 1

As of Jackson version 2.9, there is now DeserializationFeature.FAIL_ON_TRAILING_TOKENS which can be used to achieve that:

ObjectMapper objectMapper =
        new ObjectMapper().enable(DeserializationFeature.FAIL_ON_TRAILING_TOKENS);

See https://github.com/FasterXML/jackson/wiki/Jackson-Release-2.9 and https://medium.com/@cowtowncoder/jackson-2-9-features-b2a19029e9ff