java - JPA: How to handle multiple Entities -

i'm new jpa , have question how handle entitites. in case have 3 entities: user, group , event.

event belongs group. means there onetomany-relation. user can subscribe multiple groups means there manytomany-relation. part i'm having troubles. user can subscribe multiple events means there manytomany-relation.

code:

user

@entity public class user {      @id     @generatedvalue     private integer id;      @embedded     @onetoone     @joincolumn(name = "company_location")     private companylocation companylocation;      @manytomany(fetch = fetchtype.lazy)     @jointable(             name = "user_group_subscriptions",             joincolumns = @joincolumn(name = "user_id", referencedcolumnname = "id"),             inversejoincolumns = @joincolumn(name = "group_id", referencedcolumnname = "id"))     private list<group> subscribedgroups;     ... } 

group

@entity public class group {      @id     @generatedvalue     private integer id;      @onetomany(???)     private list<event> events;     ... } 

now problem. how can have list susbcribed events in group-entity depends on user-entity? goal this:

user.getsubscribedgroups().get(0).getsubscribedevents(); 

try :

@entity public class event{  @id @generatedvalue private integer id;  @manytoone @joincolumn(name = "your_column") private group group;  @manytomany @jointable(....) private list<user> users;  ...  }  @entity public class group {  @id @generatedvalue private integer id;  @onetomany(mappedby = "group") @cascade(org.hibernate.annotations.cascadetype.all) private list<event> events;  ... }