How to make method return class wrapping generic

A class has a similar type of method (let’s call it a collector). I think these methods can be a method by making it return a class wrapping generic values.

This is example code

public class Collector {
    RestTemplate restTemplate = new RestTemplate();

    /*I want to make method like this without making the Collector Class with generic value */
    public APICallResultDto<T, V> collectData() {
        APICallResultDto<T, V> result = new APICallResultDto<>();

        /* boiler plate
        * (1) complete request url
        * (2) call api
        * (3) validate response
        * (4) transform data
        * */

        return result;
    }

This code produce errors Cannot resolve symbol 'T' & Cannot resolve symbol 'V'

I know I can solve this problem by making Collector class with generic values. I want to Collector class to be singleton, I mean the bean. So I can’t do that.

Is there any way?

>Solution :

It will compile if you add <T, V> in front of return type, as shown below:

public <T, V> APICallResultDto<T, V> collectData() {
    //...
}

For reference: Generic Methods