Java 17: implementing Custom Serializer for Nested Objects Using Jackson
I'm working on a project and hit a roadblock. I'm converting an old project and I'm working with a question when trying to serialize a nested object structure using Jackson in Java 17. My class structure looks like this: ```java public class User { private String name; private Address address; // Getters and Setters } public class Address { private String street; private String city; // Getters and Setters } ``` When I try to serialize a `User` object that contains an `Address`, I get the following behavior message: ``` com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class Address ``` I've tried annotating the classes with `@JsonProperty`, but it hasn't resolved the scenario. Here’s what I attempted: ```java @JsonProperty public class User { private String name; @JsonProperty private Address address; } @JsonProperty public class Address { private String street; private String city; } ``` I also ensured that I have the Jackson dependencies in my Maven `pom.xml`: ```xml <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.12.3</version> </dependency> ``` Despite this, I'm still working with the same scenario. I have also tried creating a custom serializer for the `Address` class, but it didn't help either. Here’s the custom serializer I implemented: ```java public class AddressSerializer extends JsonSerializer<Address> { @Override public void serialize(Address address, JsonGenerator gen, SerializerProvider serializers) throws IOException { gen.writeStartObject(); gen.writeStringField("street", address.getStreet()); gen.writeStringField("city", address.getCity()); gen.writeEndObject(); } } ``` And registered it using a `SimpleModule`: ```java SimpleModule module = new SimpleModule(); module.addSerializer(Address.class, new AddressSerializer()); ObjectMapper mapper = new ObjectMapper(); mapper.registerModule(module); ``` When I attempt to serialize a `User` object now, it still throws the same behavior. I'm using Spring Boot with version 2.5.4. Any guidance on how to properly serialize nested objects using Jackson in this setup would be greatly appreciated! I've been using Java for about a year now. Any help would be greatly appreciated!