mappedBy reference an unknown target entity property role based

Ravi Kumar Ravanam :

1 user ==> many roles

1- role ==> many components

for this I have configured like

userDao.java

@Entity
@Table(name = "User_info")
public class UserDao {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int userId;
    @Column(name="username")
    private String username;
    @Column(name="password")
    @JsonIgnore
    private String password;
    @ManyToMany(cascade=CascadeType.MERGE,fetch = FetchType.EAGER)
    @JoinTable(
       name="user_role",
       joinColumns={@JoinColumn(name="USER_ID", referencedColumnName="userId")},
       inverseJoinColumns={@JoinColumn(name="ROLE_ID", referencedColumnName="roleId")})
    private List<Role> roles;

Role.java

@Entity
@Table(name = "roles")
public class Role {
    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer roleId;
    @Column(nullable = false, unique = true)
    @NotEmpty
    private String roleName;

    @ManyToMany(mappedBy = "roles")
    private List < UserDao > users;

    @ManyToMany(cascade=CascadeType.MERGE,fetch = FetchType.EAGER)
    @JoinTable(
       name="role_component",
       joinColumns={@JoinColumn(name="ROLE_ID", referencedColumnName="roleId")},
       inverseJoinColumns={@JoinColumn(name="COMP_ID", referencedColumnName="compId")})
    private List<Component> components;

component.java

@Entity
@Table(name = "component")
public class Component {

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer compId;
    @Column(nullable = false, unique = true)
    @NotEmpty
    private String compName;

    @ManyToMany(mappedBy = "component")
    private List < Role > roles;

I am getting the following error, Please suggest the mistake

Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: net.springboot.helloworldapp.bean.Role.component in net.springboot.helloworldapp.bean.Component.roles at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:785)

ruhul :

There is a typo. component should be components.

@ManyToMany(mappedBy = "components") // <- should be components private List < Role > roles;