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"org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation" to produce xml response

I try to produce xml-format data from spring boot restcontroller. Below is User model codes first.

@Entity  
@Table(name="BlogUser")
@XmlRootElement
public class User {
  @GeneratedValue(strategy=GenerationType.AUTO)
  @Column(name="USER_ID", nullable = false, unique = true)
  private Long id;
  @Column(unique=true, nullable=false)
  @Length(min=2, max=30)
  @NotEmpty
  private String username;
  @Column(nullable=false)
  @Length(min=5)
  @NotEmpty
  private String password;
  @Column
  @Email
  @NotEmpty
  private String email;
  @Column
  @NotEmpty
  private String fullname;
  @Column
  private UserRole role;
And Below codes are RestConstroller.java
@RestController
@RequestMapping(value="/rest/user")
@SessionAttributes("user")
public class UserRestController {
  @Autowired
  private UserService userService;
  @GetMapping(value="getAllUser", produces=MediaType.APPLICATION_XML_VALUE)
  public ResponseEntity<List<User>> getAllPost() {
    List<User> users = this.userService.findAll();
    if(users == null || users.isEmpty())
      return new ResponseEntity<List<User>>(HttpStatus.NO_CONTENT);
      return new ResponseEntity<List<User>>(users, HttpStatus.OK);
Json format data are successfully returned. But xml-format values are not generated. It throws the following exception.
.w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation]
I add the a few dependencies into pom.xml like below,
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-annotations</artifactId>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.dataformat</groupId>
  <artifactId>jackson-dataformat-xml</artifactId>
</dependency>
But still throws the same exception. I can not understand what I miss to solve this issue.
                also try setting the consumes=MediaType.APPLICATION_XML_VALUE in your controller endpoint.
– k9yosh
                Mar 27, 2019 at 4:17
                Sorry, I missed it since it is marked as an @Entity. Usually, I don't mix up Entities with DTOs. Try generating getters and setters in your User class.
– k9yosh
                Mar 27, 2019 at 4:23
                Thank you for reply. I use lombok to generate getter/setter method. But the same exception is thrown.
– Joseph Hwang
                Mar 27, 2019 at 4:36
I modify the method like below:
@GetMapping(value="getAllUser", produces = { "application/xml", "text/xml" }, consumes = MediaType.ALL_VALUE)
    public ResponseEntity<List<User>> getAllPost() {
It work perfectly. It return xml-type values.
        
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