Unchecked call to add (E) as a member of the raw type ArrayList and HashMap

Question

I have the following function that uses org.json.simple to create a JSON object.

public JSONObject createJSONRequest() {
    // /* Create JSON Objects */
    JSONObject jsonObject = new JSONObject();
    Map<String, String> map = new HashMap<String, String>();

    map.put(ACCESS_TOKEN_KEY, mAccessToken);            
    map.put(SESSION_ID_KEY, mSessionId);
    map.put(SNAPZ_ID_KEY, mSnapzId);
    map.put(EMAIL_KEY, mEmail);
    map.put(EMAIL_PWD_KEY, mEmailPwd);

    JSONArray list = new JSONArray();
    list.add(map);
    jsonObject.put("parameters", list);
    jsonObject.put("function", "verifyEmail");

    return jsonObject;
}

However, I continue to receive this warning when I use the lint checker.

[unchecked] unchecked call to add(E) as a member of the raw type ArrayList
        list.add(map);
                ^
where E is a type-variable: E extends Object declared in class ArrayList

 warning: [unchecked] unchecked call to put(K,V) as a member of the raw type HashMap
        jsonObject.put("parameters", list);
                      ^
where K,V are type-variables:
    K extends Object declared in class HashMap
    V extends Object declared in class HashMap

warning: [unchecked] unchecked call to put(K,V) as a member of the raw type HashMap
        jsonObject.put("function", "verifyEmail");

I tried to use a generic type. HashMap uses generics, but other objects JSONObject JSONArraydo not work.

Thanks so much for any suggestions,

Answer 1

You get this warning because the library uses internal type collections internally. To hide this warning, you annotate your method with @SuppressWarnings("unchecked").

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