A quick tutorial for using ParameterizedTypeReference with Spring HTTP clients to deserialize generic types in Java.

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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.

How to Use ParameterizedTypeReference in Java

2. Understanding Type Erasure and the Problem It Creates