When is the @JsonProperty property used and what is it used for?

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This bean ‘State’ :

public class State {

    private boolean isSet;

    @JsonProperty("isSet")
    public boolean isSet() {
        return isSet;
    }

    @JsonProperty("isSet")
    public void setSet(boolean isSet) {
        this.isSet = isSet;
    }

}

is sent over the wire using the ajax ‘ success’ callback : 

        success : function(response) {  
            if(response.State.isSet){   
                alert('success called successfully)
            }

Is the annotation @JsonProperty required here ? What is the advantage of using it ?
I think I can remove this annotation without causing any side effects.

Reading about this annotion on https://github.com/FasterXML/jackson-annotations/wiki/Jackson-Annotations I don’t know when this is required to be used ?

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