I have a simple reactive web app to learn the WebClient usage. This has just a single controller called PostController which delegates the request to an external API, fetches the response from it and then sends it to the client after serializing it. Unfortunately I am getting:

Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class com.example.spring_webclient_lombok_demo.entity.Post and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS)

Here is my application code:

PostController.java:

import java.util.List;

import .springframework.beans.factory.annotation.Autowired;
import .springframework.web.bind.annotation.GetMapping;
import .springframework.web.bind.annotation.PathVariable;
import .springframework.web.bind.annotation.RequestMapping;
import .springframework.web.bind.annotation.RestController;
import .springframework.web.reactive.function.client.WebClient;

import com.example.spring_webclient_lombok_demo.entity.Post;

import reactor.core.publisher.Mono;

@RestController
@RequestMapping("/posts")
public class PostController {
    
    @Autowired
    private WebClient webClient;

    @GetMapping("")
    public Mono<List<Post>> getPosts() {
        
        return webClient.get()
        .uri("/posts")
        .retrieve()
        .bodyToFlux(Post.class)
        .collectList();
    }
    
    @GetMapping("{postId}")
    public Mono<Post> getPostById(@PathVariable int postId) {
        
        return webClient.get()
        .uri("/posts/{id}", postId)
        .retrieve()
        .bodyToMono(Post.class);
    }
}

Post.java:

import java.util.Objects;

import com.fasterxml.jackson.databind.annotation.JsonDeserialize;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
public class Post {

    private int userId;
    private int id;
    private String title;
    private String body;
    
//  public Post() {
//      
//  }
//
//  public Post(int userId, int id, String title, String body) {
//      this.userId = userId;
//      this.id = id;
//      this.title = title;
//      this.body = body;
//  }
//
//  public int getUserId() {
//      return userId;
//  }
//
//  public void setUserId(int userId) {
//      this.userId = userId;
//  }
//
//  public int getId() {
//      return id;
//  }
//
//  public void setId(int id) {
//      this.id = id;
//  }
//
//  public String getTitle() {
//      return title;
//  }
//
//  public void setTitle(String title) {
//      this.title = title;
//  }
//
//  public String getBody() {
//      return body;
//  }
//
//  public void setBody(String body) {
//      this.body = body;
//  }
//
//  @Override
//  public int hashCode() {
//      return Objects.hash(body, id, title, userId);
//  }
//
//  @Override
//  public boolean equals(Object obj) {
//      if (this == obj)
//          return true;
//      if (obj == null)
//          return false;
//      if (getClass() != obj.getClass())
//          return false;
//      Post other = (Post) obj;
//      return Objects.equals(body, other.body) && id == other.id && Objects.equals(title, other.title)
//              && userId == other.userId;
//  }
//
//  @Override
//  public String toString() {
//      return "Post [userId=" + userId + ", id=" + id + ", title=" + title + ", body=" + body + "]";
//  }
}

SpringWebclientLombokDemoApplication.java

import .springframework.boot.SpringApplication;
import .springframework.boot.autoconfigure.SpringBootApplication;
import .springframework.context.annotation.Bean;
import .springframework.web.reactive.function.client.WebClient;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

@SpringBootApplication
public class SpringWebclientLombokDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringWebclientLombokDemoApplication.class, args);
    }
    
    @Bean
    public WebClient getWebClient() {
        return WebClient.builder()
                .baseUrl(";) // Set base URL
                .build();
    }
}

pom.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <project xmlns=".0.0" xmlns:xsi=";
        xsi:schemaLocation=".0.0 .0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>3.4.3</version>
            <relativePath/> <!-- lookup parent from repository -->
        </parent>
        <groupId>com.example</groupId>
        <artifactId>spring-webclient-lombok-demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>war</packaging>
        <name>spring-webclient-lombok-demo</name>
        <description>Demo spring project for practicing Webclient and Lombok</description>
        <url/>
        <licenses>
            <license/>
        </licenses>
        <developers>
            <developer/>
        </developers>
        <scm>
            <connection/>
            <developerConnection/>
            <tag/>
            <url/>
        </scm>
        <properties>
            <java.version>17</java.version>
        </properties>
        <dependencies>
            <dependency>
                <groupId>.springframework.boot</groupId>
                <artifactId>spring-boot-starter-validation</artifactId>
            </dependency>
            <dependency>
                <groupId>.springframework.boot</groupId>
                <artifactId>spring-boot-starter-webflux</artifactId>
            </dependency>

            <dependency>
                <groupId>.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>io.projectreactor</groupId>
                <artifactId>reactor-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>

        <build>
            <plugins>
                <plugin>
                    <groupId>.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <annotationProcessorPaths>
                            <path>
                                <groupId>.projectlombok</groupId>
                                <artifactId>lombok</artifactId>
                            </path>
                        </annotationProcessorPaths>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <excludes>
                            <exclude>
                                <groupId>.projectlombok</groupId>
                                <artifactId>lombok</artifactId>
                            </exclude>
                        </excludes>
                    </configuration>
                </plugin>
            </plugins>
        </build>

    </project>

When I uncomment the explicit getters, setters, no-arg constructor, all-arg constructor, etc. in Post.java and remove the lombok annotations then I get the correct response. Why lombok annotations are not working here?