org hibernate MappingException Could not determine type for java util Set

Question

Although this question asked many times and I have already used all the suggestion but still I am getting this error   The User java is   Entity  Table name    USER   public class User implements UserDetails  Serializable        private static final long serialVersionUID   2L        Id      Column name    USER ID        GeneratedValue strategy   GenerationType IDENTITY      private long id       Column name    USERNAME       private String username       Column name    PASSWORD       private String password       Column name    NAME       private String name       Column name    EMAIL       private String email       Column name    LOCKED       private boolean locked       OneToMany cascade CascadeType ALL  fetch   FetchType EAGER       ElementCollection targetClass Role class       Column name    ROLE ID       private Set lt Role gt  roles        Override     public GrantedAuthority   getAuthorities             List lt GrantedAuthorityImpl gt  list   new ArrayList lt GrantedAuthorityImpl gt  0           for  Role role   roles                list add new GrantedAuthorityImpl role getRole                        return  GrantedAuthority    list toArray new GrantedAuthority list size                  Override     public boolean isAccountNonExpired             return true              Override     public boolean isAccountNonLocked             return  isLocked                Override     public boolean isCredentialsNonExpired             return true              Override     public boolean isEnabled             return true             public long getId             return id             public void setId long id            this id   id             public String getName             return name             public void setName String name            this name   name             public String getEmail             return email             public void setEmail String email            this email   email             public boolean isLocked             return locked             public void setLocked boolean locked            this locked   locked              Override     public String getUsername             return username             public void setUsername String username            this username   username              Override     public String getPassword             return password             public void setPassword String password            this password   password             public void setRoles Set lt Role gt  roles            this roles   roles             public Set lt Role gt  getRoles             return roles            And the Role java is   Entity  Table name  ROLE   public class Role implements Serializable         Id      GeneratedValue strategy   GenerationType IDENTITY       Column name  ROLE ID       private long id       Column name  USERNAME       private String username       Column name  ROLE       private String role        public long getId             return id             public void setId long id            this id   id             public String getUsername             return username             public void setUsername String username            this username   username             public String getRole             return role             public void setRole String role            this role   role            This is my first attempt in hibernate annotation with JPA  So any suggestions will be very helpful    For hibernate the pom xml s dependencies are        lt dependency gt           lt groupId gt org hibernate lt  groupId gt           lt artifactId gt hibernate lt  artifactId gt           lt version gt 3 5 4-Final lt  version gt           lt type gt pom lt  type gt           lt scope gt compile lt  scope gt       lt  dependency gt       lt dependency gt           lt groupId gt org hibernate lt  groupId gt           lt artifactId gt hibernate-annotations lt  artifactId gt           lt version gt 3 5 4-Final lt  version gt           lt type gt jar lt  type gt           lt scope gt compile lt  scope gt       lt  dependency gt        lt dependency gt           lt groupId gt org hibernate lt  groupId gt           lt artifactId gt hibernate-core lt  artifactId gt           lt version gt 3 5 4-Final lt  version gt           lt type gt jar lt  type gt           lt scope gt compile lt  scope gt       lt  dependency gt       lt dependency gt           lt groupId gt org hibernate lt  groupId gt           lt artifactId gt hibernate-validator lt  artifactId gt           lt version gt 3 1 0 GA lt  version gt           lt type gt jar lt  type gt           lt scope gt compile lt  scope gt       lt  dependency gt       lt dependency gt           lt groupId gt org hibernate lt  groupId gt           lt artifactId gt hibernate-entitymanager lt  artifactId gt           lt version gt 3 5 4-Final lt  version gt           lt type gt jar lt  type gt           lt scope gt compile lt  scope gt       lt  dependency gt    I have no clue about the fault   Thanks

User · Answer

Not saying your mapping is correct or wrong but I think hibernate wants a instance of the set where you declare the field    OneToMany cascade CascadeType ALL  fetch   FetchType EAGER     ElementCollection targetClass Role class   Column name    ROLE ID   private Set lt Role gt  roles   new HashSet lt Role gt

User · Answer

I had a similar issue where I was getting an error for a member in the class that wasn t mapped to the db column  it was just a holder for a List of another entity  I changed List to ArrayList and the error went away  I know  I really shouldn t do that in a mapped entity  and that s what DTO s are for  Just wanted to share in case someone finds this thread and the answers above don t apply or help

User · Answer

My guess is you are using a Set lt Role gt  in the User class annotated with  OneToMany  Which means one User has many Roles  But on the same field you use the  Column annotation which makes no sense  One-to-many relationships are managed using a separate join table or a join column on the many side  which in this case would be the Role class  Using  JoinColumn instead of  Column would probably fix the issue  but it seems semantically wrong  I guess the relationship between role and user should be many-to-many

User · Answer

I had similar problem I found the issue I was mixing the annotations some of them above the attributes and some of them above public methods  I just put all of them above attributes and it works

User · Answer

You may just need to add  Transient annotations on roles to not serialize the set   Why does Java have transient fields

User · Answer

Solution    Entity  Table name    USER    Access AccessType FIELD  public class User implements UserDetails  Serializable        private static final long serialVersionUID   2L        Id      Column name    USER ID   updatable false  nullable false       GeneratedValue strategy   GenerationType IDENTITY      private long id        Column name    USERNAME       private String username        Column name    PASSWORD       private String password        Column name    NAME       private String name        Column name    EMAIL       private String email        Column name    LOCKED       private boolean locked        OneToMany cascade   CascadeType ALL  fetch   FetchType EAGER  targetEntity   Role class       JoinTable name    USER ROLE   joinColumns      JoinColumn name    USER ID      inverseJoinColumns      JoinColumn name    ROLE ID          private Set lt Role gt  roles        Override     public GrantedAuthority   getAuthorities             List lt GrantedAuthorityImpl gt  list   new ArrayList lt GrantedAuthorityImpl gt  0           for  Role role   roles                list add new GrantedAuthorityImpl role getRole                        return  GrantedAuthority    list toArray new GrantedAuthority list size                  Override     public boolean isAccountNonExpired             return true              Override     public boolean isAccountNonLocked             return  isLocked                Override     public boolean isCredentialsNonExpired             return true              Override     public boolean isEnabled             return true             public long getId             return id             public void setId long id            this id   id              Override     public String getUsername             return username             public void setUsername String username            this username   username              Override     public String getPassword             return password             public void setPassword String password            this password   password             public String getName             return name             public void setName String name            this name   name             public String getEmail             return email             public void setEmail String email            this email   email             public boolean isLocked             return locked             public void setLocked boolean locked            this locked   locked             public Set lt Role gt  getRoles             return roles             public void setRoles Set lt Role gt  roles            this roles   roles            Role java same as above

User · Answer

I got the same problem with  ManyToOne column  It was solved    in stupid way  I had all other annotations for public getter methods  because they were overridden from parent class  But last field was annotated for private variable like in all other classes in my project  So I got the same MappingException without the reason   Solution  I placed all annotations at public getter methods  I suppose  Hibernate can t handle cases  when annotations for private fields and public getters are mixed in one class

User · Answer

Had this issue just today and discovered that I inadvertently left off the  ManyToMany annotation above the  JoinTable annotation

User · Answer

Adding the  ElementCollection to the List field solved this issue    Column  ElementCollection targetClass Integer class  private List lt Integer gt  countries

[java] org.hibernate.MappingException: Could not determine type for: java.util.Set

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