CODEWITHSUNDEEP
javahibernatemappingdozer
Avinash Tripathy
Avinash Tripathy

Reputation: 7

Hi All, I am facing some Mapping Exception. I know it's because of different fields in class, please suggest some ways to overcome it

This is my UserDTO class which I am using to store values coming from UI. 

public class UserDTO {
 private String emailId;
 private String password;
 private String role;
 // getters and setters
}

And this is the Entity class which deals with the database(i am using hibernate).

public class UserEntity {
  @Id
  @Column(name = "EmailId")
  private String emailId;

  @Column(name = "Password")
  private String password;

  @ManyToOne
  @JoinColumn(name = "role_id", nullable = false)
  RoleEntity role;
  // getters and setters
}

And following is the RoleEntitity Class which is having a string role field.

public class RoleEntity {
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  @Column(name = "role_id")
  private int id;

  @Column(name = "role")
  private String role;
  // getters and setters
}

I am getting user values from UI in request body.

@RequestMapping(value = "/createUser", method = RequestMethod.POST, produces= {"application/json"})
public ResponseEntity<String> createUser(@RequestBody UserDTO userDTO) {
    return new ResponseEntity<String>(adminService.createUser(userDTO), HttpStatus.CREATED);
}

Here, I want to map the role from UserDTO to the RoleEntity. I am using dozer mapper map method to map DTO to Entity. dozerMapper is an object of DozerBeanMapper. userDTO is an object of UserDTO and userEntity an object of UserEntity.

//In createUser(UserDTO userDTO)
  dozerMapper.map(userDTO, userEntity);

Errors:

MapId: null
Type: null
Source parent class: com.iiminds.crm.dto.UserDTO
Source field name: role
Source field type: class java.lang.String
Source field value: Admin
Dest parent class: com.iiminds.crm.entity.UserEntity
Dest field name: role
Dest field type: com.iiminds.crm.entity.RoleEntity

org.dozer.MappingException: Illegal object type for the method 'setRole'. 
 Expected types: 
com.iiminds.crm.entity.RoleEntity
 Actual types: 
java.lang.String

2018-10-29 16:15:39.229 ERROR 11516 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[.[dispatcherServlet]      : Servlet.service() for servlet [dispatcherServlet] in context with path [/crm] threw exception [Request processing failed; nested exception is org.dozer.MappingException: Illegal object type for the method 'setRole'. 
 Expected types: 
com.iiminds.crm.entity.RoleEntity
 Actual types: 
java.lang.String] with root cause

Upvotes: 0

Views: 1750

Answers (1)

codeLover
codeLover

Reputation: 2592

It is because in your UserDTO.java you have role as String while in UserEntity.java type of role is RoleEntity. You cannot map String to RoleEntity. However, in mapping file you can exclude role field from mapping like:

    <class-a>UserDTO</class-a>
    <class-b>UserEntity</class-b>
    <field-exclude>
        <a>role</a> 
        <b>role</b> 
    </field-exclude>

P.S: Fill fully qualified class name.

Then you can manually create RoleEntity and set it to role in UserEntity

Upvotes: 0

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