SpringBoot RestAPI Controller methods are not working

Question

I wrote a few service methods. When I implement CommandLineRunner to my SpringApplication and try to execute service methods in run methods I can see they're working.

I mean like this approach, I can reach the data via service methods. So I can say yes my services are working right.

      public void run(String... args) throws Exception {

      postService.getAllPost()
            .stream()
            .forEach(entry -> System.out.println(entry.getTitle()));

      }

But When I try to use my controllers via postman. For the User class, everything is fine.

  public List<UserDto> getAllUsers() {

    return userRepository.findAll()
            .stream()
            .map(userMapper::toDto)
            .collect(toList());
   }


       @GetMapping("/get")
public ResponseEntity<List<UserDto>> getAll() {

    return ResponseEntity.ok(userService.getAllUsers());
}

But Comment and Post are not working. The methods are almost same. I was wondering is it about my entities relation? Because in User entity I just have 3 different field which is Long, String , String . But the other entities are related with each others. With OneToMany relational. And I dont trust about my business plan. I mean post class includes user and comment object. Comment class includes user object etc.

This is controller method.

@GetMapping("/getAll")

 public ResponseEntity<List<CommentDto>> fetchAll() {

    return ResponseEntity.ok(commentService.getAllComments());
 }

This is service method.

  public List<CommentDto> getAllComments() {

    return commentRepository.findAll().stream()
            .map(commentMapper::toDto)
            .collect(Collectors.toList());

 }

 

I have three different entity class.

Which is

@Entity
@Table(name = "user_table")
public class User{

@Id
private Long id;
private String userName;
private String password; 
}


@Entity
@Table(name = "post_table")
public class Post {

@Id
private Long id;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "user_id" , nullable = false)
@OnDelete(action = OnDeleteAction.CASCADE)
@JsonIgnore
private User user;

private String title;
@Lob
@Column(columnDefinition = "text")
private String text;
}


@Entity
@Table(name = "comment_table")

public class Comment {

@Id
private Long id;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "post_id" , nullable = false)
@OnDelete(action = OnDeleteAction.CASCADE)
@JsonIgnore
private Post post;


@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "user_id" , nullable = false)
@OnDelete(action = OnDeleteAction.CASCADE)
@JsonIgnore
private User user;

@Lob
@Column(columnDefinition = "text")
private String text;