ManyToMany & fields of association table

[Musab Al-Rawi]

I am posting my question here since I didn't get much of response in the other forum, and it is more relevant here, sorry for repeating the question:

Here is an example to explain my questions:
let's say there is entity FOLDER that has a many to many relationship with GROUP. I could do the design as follows:

+------+        +------------+     +-----+
|FOLDER|--------|FOLDER_GROUP|-------|GROUP|
+------+ 1    n +------------+ n    1+-----+
  |                |    |  |           |
  |                |    |  |           |
  |                |    |  |           |
(F_ID)            (G_ID)| (INFO)      (G_ID)
                        |
                      (F_ID)
 

Where and How can I represent INFO?
Is the following a better design (of courseDUMMY entity won't be named DUMMY!)?

 
+-----+
|GROUP|----(G_ID)
+-----+
  1|
   |
                   |
                  n|
+------+        +------------+     +-----+
|FOLDER|--------|FOLDER_GROUP|-------|DUMMY|
+------+ 1    n +------------+ 1    1+-----+
  |                |    |  |           |   |
  |                |    |  |           |   |
  |                |    |  |           |   |
(F_ID)            (G_ID)| (D_ID)     (D_ID)|
                        |                (INFO)
                      (F_ID)
 

Personally I want to go for the first design but I don't know how to represent INFO field.
In that case I define Folder and Group entities as follows:
In Folder
folder

@ManyToMany
       @JoinTable(
               schema="test", name="folder_group",
               joinColumns=
                       @JoinColumn(name="folder_id", referencedColumnName="id"),
               inverseJoinColumns=
                       @JoinColumn(name="group_id", referencedColumnName="id")
       )
       private Set<Group> folderPriv;

In Group

@ManyToMany (mappedBy="folderPriv")
private Set<Folder> folderPriv;

Again how to access INFO column located in folder_group table?
Some suggested that I could use two OneToMany relationships which is possible but I am trying to figure if there is a direct solution for the situation.

Your help is greatly appreciated.

[Edvins Reisons]

A typical approach is to decompose the many-to-many relationship into two many-to-one. Then your Folder Group becomes an entity and can contain any number of additional mapped properties.