Spring RestTemplate and generic types ParameterizedTypeReference collections like List

Question

An Abstract controller class requires List of objects from REST. While using Spring RestTemplate its not mapping it to required class instead it returns Linked HashMAp

Answer 1

I did this a bit different. In my situation, I had a base class where I was implementing a set of CRUD operations and then using derived classes to implement specific resource types.

In the base class, I was trying to define a ParameterizedTypeReference as follows:

ParameterizedTypeReference> typeRef = 
  new ParameterizedTypeReference>() {};

This didn't work so I ended up creating an abstract method in the base class:

protected abstract ParameterizedTypeReference> 
getServicePagedResultTypeRef();

and then in the derived classes:

@Override
protected ParameterizedTypeReference>
getServicePagedResultTypeRef() {
  return new ParameterizedTypeReference>() {};
}

I could then use that in the base class like:

ResponseEntity> response = lbRestTemplate.exchange(
  uri, HttpMethod.GET, null, getServicePagedResultTypeRef(), uriVariables);