How to Use ParameterizedTypeReference in Java

Spring's ParameterizedTypeReference solves Java's type erasure problem when working with generic collections in HTTP clients. The tutorial demonstrates how to use it with both RestTemplate and WebClient to properly deserialize generic types like List<User> and Map<String, List<User>>. Key concepts include understanding when to use ParameterizedTypeReference versus simple class types, the difference between getForEntity() and exchange() methods, handling reactive types with WebClient, and performance optimization through reusing static type reference instances.