spring boot unable to deserialize nested entities to xml - spring-boot

Question

I am having one-to-many relationship between Order and LineItem entities. I am exposing them as json response from the RestController.
Order:
#Entity
#Data
#Builder
#NoArgsConstructor
#AllArgsConstructor
#Table(name = "orders")
#XmlRootElement
public class Order {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long orderId;
private String name;
private String email;
private double price;
#OneToMany(mappedBy = "order", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private Set<LineItem> lineItems;
public void addLineItem(LineItem lineItem){
if(this.lineItems == null){
this.lineItems = new HashSet<>();
}
this.lineItems.add(lineItem);
lineItem.setOrder(this);
}
}
LineItem:
#Data
#NoArgsConstructor
#AllArgsConstructor
#Builder
#Getter
#Entity
#ToString(exclude = "order")
#EqualsAndHashCode(exclude = "order")
public class LineItem {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private int qty;
private String name;
private double price;
#ManyToOne
#JoinColumn(name="order_id", nullable = false)
#JsonIgnore
private Order order;
}
The below is my Confiuguration class
#Configuration
public class ApplicationWebConfiguration extends WebMvcConfigurerAdapter {
#Override
public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
//set path extension to true
configurer.favorPathExtension(false).
//set favor parameter to false
favorParameter(true).
parameterName("mediaType").
//ignore the accept headers
ignoreAcceptHeader(true).
//dont use Java Activation Framework since we are manually specifying the mediatypes required below
useJaf(false).
defaultContentType(MediaType.APPLICATION_JSON).
mediaType("xml", MediaType.APPLICATION_XML).
mediaType("json", MediaType.APPLICATION_JSON);
}
}
When I am invoking the request from the browser http://localhost:8222/api/v1/orders?mediaType=xml, I am getting the below error:
Resolved [org.springframework.http.converter.HttpMessageNotWritableException: No converter for [class java.util.ImmutableCollections$SetN] with preset Content-Type 'null']
2022-03-21 22:58:57.511 WARN 153436 --- [nio-8222-exec-1] .m.m.a.ExceptionHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation]
2022-03-21 22:58:59.931 WARN 153436 --- [nio-8222-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.http.converter.HttpMessageNotWritableException: No converter for [class java.util.ImmutableCollections$SetN] with preset Content-Type 'null']
2022-03-21 22:58:59.933 WARN 153436 --- [nio-8222-exec-3] .m.m.a.ExceptionHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation]
I have added the below dependency as well in the pom.xml
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.13.1</version>
</dependency>
Where am I going wrong?