Webflux webclient and generic types

Question

I am trying to build a generic class that will consume a REST api. The api returns lists of objects depending on the url.

I have built a Generic class

public class RestConsumer<T> {
    WebClient client;

    public RestConsumer(){
        //Initialize client
    }

    public List<T> getList(String relativeUrl){
        try{
            return client
                .get()
                .uri(relativeUrl)
                .retrieve()
                .bodyToMono(new ParameterizeTypeReference<List<T>> (){}
                .block()
        catch(Exception e){}
}

}

The problem is that T is replaced by Object at compilation time and the whole thing return a List of LinkedHashMap instead of a List of T. I tried lots of workarounds but no luck. Any suggestions?

Answer 1

I encountered the same problem and in order to work I added ParameterizedTypeReference as a parameter for that function.

public <T> List<T> getList(String relativeUrl, 
                           ParameterizedTypeReference<List<T>> typeReference){
    try{
        return client
            .get()
            .uri(relativeUrl)
            .retrieve()
            .bodyToMono(typeReference)
            .block();
    } catch(Exception e){
        return null;
    }
}

And call that function with

ParameterizedTypeReference<List<MyClass>> typeReference = new ParameterizedTypeReference<List<MyClass>>(){};
List<MyClass> strings = getList(relativeUrl, typeReference);