Managing many to many relationship with hibernate

I am making simple spring mvc web app and I am using hibernate with oracle. I have two models - User and role and I want to define many to many relationship between them. I have seen several tutorials and have defined my models as shown below:

This is User class:

@Entity

@Table(name = "AppUser")

public class User {



    @Id

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")

    @SequenceGenerator(name = "id_sequence", sequenceName = "ID_SEQ")

    @Column(name = "Id")

    private int id;



    @Column(name = "Username")

    private String username;



    @Column(name = "Password")

    private String password;





    @ManyToMany

    (

        fetch = FetchType.LAZY,

        cascade = {

                      CascadeType.PERSIST,

                      CascadeType.MERGE

                  }

    )

    @JoinTable

    (

        name = "user_roles", 

        joinColumns = { @JoinColumn(name = "user_id", referencedColumnName = "id") }, 

        inverseJoinColumns = { @JoinColumn(name = "role_id", referencedColumnName = "id") }

    )

    private Set<Role> roles = new HashSet<Role>(0);



    //getters and setters....

}

This is Role class:

@Entity

@Table(name = "role")

public class Role {



    @Id

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")

    @SequenceGenerator(name = "id_sequence", sequenceName = "ID_SEQ")

    private int id;



    private String role;



    @ManyToMany

    (

        fetch = FetchType.LAZY, 

        cascade = {

                      CascadeType.PERSIST,

                      CascadeType.MERGE

                  },

        mappedBy = "roles"

    )

    private Set<User> users;



    //getters and setters....

}

When I run this app on server I get the following error:

enter image description here

This error says that table doesn't exist, so I am interested in should I create it manually(I do not think so) or am I missing anything here?

asked Nov 25 '18 at 17:56

Alexander Mujirishvili

8517

what is the value for property spring.jpa.hibernate.ddl-auto in your configuration files? It should be update.

– guleryuz
Nov 25 '18 at 18:49

I have this in my configuration file: hibernate.hbm2ddl.auto=update

– Alexander Mujirishvili
Nov 25 '18 at 18:57

The error ORA-00942: table or view does not exist occurs when trying to execute an ALTER TABLE on the table user_roles, referencing the table or view AppUser. Perhaps that provides a clue...

– Bob Jarvis
Nov 25 '18 at 19:11

At this moment my database is empty and I am expecting from hibernate to generate corresponding tables automatically. Which table should be created first?

– Alexander Mujirishvili
Nov 25 '18 at 19:15

add a comment |

This is User class:

@Entity

@Table(name = "AppUser")

public class User {



    @Id

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")

    @SequenceGenerator(name = "id_sequence", sequenceName = "ID_SEQ")

    @Column(name = "Id")

    private int id;



    @Column(name = "Username")

    private String username;



    @Column(name = "Password")

    private String password;





    @ManyToMany

    (

        fetch = FetchType.LAZY,

        cascade = {

                      CascadeType.PERSIST,

                      CascadeType.MERGE

                  }

    )

    @JoinTable

    (

        name = "user_roles", 

        joinColumns = { @JoinColumn(name = "user_id", referencedColumnName = "id") }, 

        inverseJoinColumns = { @JoinColumn(name = "role_id", referencedColumnName = "id") }

    )

    private Set<Role> roles = new HashSet<Role>(0);



    //getters and setters....

}

This is Role class:

@Entity

@Table(name = "role")

public class Role {



    @Id

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")

    @SequenceGenerator(name = "id_sequence", sequenceName = "ID_SEQ")

    private int id;



    private String role;



    @ManyToMany

    (

        fetch = FetchType.LAZY, 

        cascade = {

                      CascadeType.PERSIST,

                      CascadeType.MERGE

                  },

        mappedBy = "roles"

    )

    private Set<User> users;



    //getters and setters....

}

When I run this app on server I get the following error:

enter image description here

This error says that table doesn't exist, so I am interested in should I create it manually(I do not think so) or am I missing anything here?

asked Nov 25 '18 at 17:56

Alexander Mujirishvili

8517

what is the value for property spring.jpa.hibernate.ddl-auto in your configuration files? It should be update.

– guleryuz
Nov 25 '18 at 18:49

I have this in my configuration file: hibernate.hbm2ddl.auto=update

– Alexander Mujirishvili
Nov 25 '18 at 18:57

The error ORA-00942: table or view does not exist occurs when trying to execute an ALTER TABLE on the table user_roles, referencing the table or view AppUser. Perhaps that provides a clue...

– Bob Jarvis
Nov 25 '18 at 19:11

At this moment my database is empty and I am expecting from hibernate to generate corresponding tables automatically. Which table should be created first?

– Alexander Mujirishvili
Nov 25 '18 at 19:15

add a comment |

This is User class:

@Entity

@Table(name = "AppUser")

public class User {



    @Id

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")

    @SequenceGenerator(name = "id_sequence", sequenceName = "ID_SEQ")

    @Column(name = "Id")

    private int id;



    @Column(name = "Username")

    private String username;



    @Column(name = "Password")

    private String password;





    @ManyToMany

    (

        fetch = FetchType.LAZY,

        cascade = {

                      CascadeType.PERSIST,

                      CascadeType.MERGE

                  }

    )

    @JoinTable

    (

        name = "user_roles", 

        joinColumns = { @JoinColumn(name = "user_id", referencedColumnName = "id") }, 

        inverseJoinColumns = { @JoinColumn(name = "role_id", referencedColumnName = "id") }

    )

    private Set<Role> roles = new HashSet<Role>(0);



    //getters and setters....

}

This is Role class:

@Entity

@Table(name = "role")

public class Role {



    @Id

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")

    @SequenceGenerator(name = "id_sequence", sequenceName = "ID_SEQ")

    private int id;



    private String role;



    @ManyToMany

    (

        fetch = FetchType.LAZY, 

        cascade = {

                      CascadeType.PERSIST,

                      CascadeType.MERGE

                  },

        mappedBy = "roles"

    )

    private Set<User> users;



    //getters and setters....

}

When I run this app on server I get the following error:

enter image description here

This error says that table doesn't exist, so I am interested in should I create it manually(I do not think so) or am I missing anything here?

asked Nov 25 '18 at 17:56

Alexander Mujirishvili

8517

This is User class:

@Entity

@Table(name = "AppUser")

public class User {



    @Id

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")

    @SequenceGenerator(name = "id_sequence", sequenceName = "ID_SEQ")

    @Column(name = "Id")

    private int id;



    @Column(name = "Username")

    private String username;



    @Column(name = "Password")

    private String password;





    @ManyToMany

    (

        fetch = FetchType.LAZY,

        cascade = {

                      CascadeType.PERSIST,

                      CascadeType.MERGE

                  }

    )

    @JoinTable

    (

        name = "user_roles", 

        joinColumns = { @JoinColumn(name = "user_id", referencedColumnName = "id") }, 

        inverseJoinColumns = { @JoinColumn(name = "role_id", referencedColumnName = "id") }

    )

    private Set<Role> roles = new HashSet<Role>(0);



    //getters and setters....

}

This is Role class:

@Entity

@Table(name = "role")

public class Role {



    @Id

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_sequence")

    @SequenceGenerator(name = "id_sequence", sequenceName = "ID_SEQ")

    private int id;



    private String role;



    @ManyToMany

    (

        fetch = FetchType.LAZY, 

        cascade = {

                      CascadeType.PERSIST,

                      CascadeType.MERGE

                  },

        mappedBy = "roles"

    )

    private Set<User> users;



    //getters and setters....

}

When I run this app on server I get the following error:

enter image description here

This error says that table doesn't exist, so I am interested in should I create it manually(I do not think so) or am I missing anything here?

java oracle hibernate spring-mvc

asked Nov 25 '18 at 17:56

Alexander Mujirishvili

8517

asked Nov 25 '18 at 17:56

Alexander Mujirishvili

8517

asked Nov 25 '18 at 17:56

Alexander Mujirishvili

8517

asked Nov 25 '18 at 17:56

Alexander Mujirishvili

8517

asked Nov 25 '18 at 17:56

Alexander Mujirishvili

8517

what is the value for property spring.jpa.hibernate.ddl-auto in your configuration files? It should be update.

– guleryuz
Nov 25 '18 at 18:49

I have this in my configuration file: hibernate.hbm2ddl.auto=update

– Alexander Mujirishvili
Nov 25 '18 at 18:57

The error ORA-00942: table or view does not exist occurs when trying to execute an ALTER TABLE on the table user_roles, referencing the table or view AppUser. Perhaps that provides a clue...

– Bob Jarvis
Nov 25 '18 at 19:11

At this moment my database is empty and I am expecting from hibernate to generate corresponding tables automatically. Which table should be created first?

– Alexander Mujirishvili
Nov 25 '18 at 19:15

add a comment |

what is the value for property spring.jpa.hibernate.ddl-auto in your configuration files? It should be update.

– guleryuz
Nov 25 '18 at 18:49

I have this in my configuration file: hibernate.hbm2ddl.auto=update

– Alexander Mujirishvili
Nov 25 '18 at 18:57

The error ORA-00942: table or view does not exist occurs when trying to execute an ALTER TABLE on the table user_roles, referencing the table or view AppUser. Perhaps that provides a clue...

– Bob Jarvis
Nov 25 '18 at 19:11

At this moment my database is empty and I am expecting from hibernate to generate corresponding tables automatically. Which table should be created first?

– Alexander Mujirishvili
Nov 25 '18 at 19:15

what is the value for property spring.jpa.hibernate.ddl-auto in your configuration files? It should be update.

– guleryuz
Nov 25 '18 at 18:49

I have this in my configuration file: hibernate.hbm2ddl.auto=update

– Alexander Mujirishvili
Nov 25 '18 at 18:57

The error ORA-00942: table or view does not exist occurs when trying to execute an ALTER TABLE on the table user_roles, referencing the table or view AppUser. Perhaps that provides a clue...

– Bob Jarvis
Nov 25 '18 at 19:11

At this moment my database is empty and I am expecting from hibernate to generate corresponding tables automatically. Which table should be created first?

– Alexander Mujirishvili
Nov 25 '18 at 19:15

add a comment |

1 Answer
1

active

oldest

votes

Just need to put @ManyToMany in one place only.

Please remove @ManyToMany in Role entity.
You can check the link below in order to deal @ManyToMany using oracle database.
I hope this is helpful:

https://gerardnico.com/jpa/many-to-many#oracle_database

edited Nov 25 '18 at 19:49

answered Nov 25 '18 at 19:31

Jonathan Johx

1,7751317

I have tried it and same happens..

– Alexander Mujirishvili
Nov 25 '18 at 19:33

Why did you put new HashSet<Role>(0); ? 0? Try remove it ..

– Jonathan Johx
Nov 25 '18 at 19:34

I removed it but same..

– Alexander Mujirishvili
Nov 25 '18 at 19:36

Oh right!! I noticed that you are working on oracle datanse, let me edit my answer

– Jonathan Johx
Nov 25 '18 at 19:42

@AlexanderMujirishvili done

– Jonathan Johx
Nov 25 '18 at 19:47

|
show 1 more comment

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

Just need to put @ManyToMany in one place only.

Please remove @ManyToMany in Role entity.
You can check the link below in order to deal @ManyToMany using oracle database.
I hope this is helpful:

https://gerardnico.com/jpa/many-to-many#oracle_database

edited Nov 25 '18 at 19:49

answered Nov 25 '18 at 19:31

Jonathan Johx

1,7751317

I have tried it and same happens..

– Alexander Mujirishvili
Nov 25 '18 at 19:33

Why did you put new HashSet<Role>(0); ? 0? Try remove it ..

– Jonathan Johx
Nov 25 '18 at 19:34

I removed it but same..

– Alexander Mujirishvili
Nov 25 '18 at 19:36

Oh right!! I noticed that you are working on oracle datanse, let me edit my answer

– Jonathan Johx
Nov 25 '18 at 19:42

@AlexanderMujirishvili done

– Jonathan Johx
Nov 25 '18 at 19:47

|
show 1 more comment

Just need to put @ManyToMany in one place only.

Please remove @ManyToMany in Role entity.
You can check the link below in order to deal @ManyToMany using oracle database.
I hope this is helpful:

https://gerardnico.com/jpa/many-to-many#oracle_database

edited Nov 25 '18 at 19:49

answered Nov 25 '18 at 19:31

Jonathan Johx

1,7751317

I have tried it and same happens..

– Alexander Mujirishvili
Nov 25 '18 at 19:33

Why did you put new HashSet<Role>(0); ? 0? Try remove it ..

– Jonathan Johx
Nov 25 '18 at 19:34

I removed it but same..

– Alexander Mujirishvili
Nov 25 '18 at 19:36

Oh right!! I noticed that you are working on oracle datanse, let me edit my answer

– Jonathan Johx
Nov 25 '18 at 19:42

@AlexanderMujirishvili done

– Jonathan Johx
Nov 25 '18 at 19:47

|
show 1 more comment

Just need to put @ManyToMany in one place only.

Please remove @ManyToMany in Role entity.
You can check the link below in order to deal @ManyToMany using oracle database.
I hope this is helpful:

https://gerardnico.com/jpa/many-to-many#oracle_database

edited Nov 25 '18 at 19:49

answered Nov 25 '18 at 19:31

Jonathan Johx

1,7751317

Just need to put @ManyToMany in one place only.

Please remove @ManyToMany in Role entity.
You can check the link below in order to deal @ManyToMany using oracle database.
I hope this is helpful:

https://gerardnico.com/jpa/many-to-many#oracle_database

edited Nov 25 '18 at 19:49

answered Nov 25 '18 at 19:31

Jonathan Johx

1,7751317

edited Nov 25 '18 at 19:49

answered Nov 25 '18 at 19:31

Jonathan Johx

1,7751317

answered Nov 25 '18 at 19:31

Jonathan Johx

1,7751317

answered Nov 25 '18 at 19:31

Jonathan Johx

1,7751317

I have tried it and same happens..

– Alexander Mujirishvili
Nov 25 '18 at 19:33

Why did you put new HashSet<Role>(0); ? 0? Try remove it ..

– Jonathan Johx
Nov 25 '18 at 19:34

I removed it but same..

– Alexander Mujirishvili
Nov 25 '18 at 19:36

Oh right!! I noticed that you are working on oracle datanse, let me edit my answer

– Jonathan Johx
Nov 25 '18 at 19:42

@AlexanderMujirishvili done

– Jonathan Johx
Nov 25 '18 at 19:47

|
show 1 more comment

I have tried it and same happens..

– Alexander Mujirishvili
Nov 25 '18 at 19:33

Why did you put new HashSet<Role>(0); ? 0? Try remove it ..

– Jonathan Johx
Nov 25 '18 at 19:34

I removed it but same..

– Alexander Mujirishvili
Nov 25 '18 at 19:36

Oh right!! I noticed that you are working on oracle datanse, let me edit my answer

– Jonathan Johx
Nov 25 '18 at 19:42

@AlexanderMujirishvili done

– Jonathan Johx
Nov 25 '18 at 19:47

I have tried it and same happens..

– Alexander Mujirishvili
Nov 25 '18 at 19:33

Why did you put new HashSet<Role>(0); ? 0? Try remove it ..

– Jonathan Johx
Nov 25 '18 at 19:34

I removed it but same..

– Alexander Mujirishvili
Nov 25 '18 at 19:36

Oh right!! I noticed that you are working on oracle datanse, let me edit my answer

– Jonathan Johx
Nov 25 '18 at 19:42

@AlexanderMujirishvili done

– Jonathan Johx
Nov 25 '18 at 19:47

|
show 1 more comment

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