Question

I have three entities with relation UserDetails hasmany FiledTask and Task hasMany FiledTask. All I want is list of FiledTask of particular User

For UserDetails:

@OneToMany(mappedBy="user",cascade=CascadeType.ALL)
Collection<FiledTask> filedTasks = new ArrayList<FiledTask>();

And for Tasks I have

@OneToMany(mappedBy="task")
Collection<FiledTask> filedTasks = new ArrayList<FiledTask>();

And FiledTask looks like

@ManyToOne
@JoinColumn(nullable = false, name = "taskId")
private Tasks task;
@ManyToOne
@JoinColumn(nullable = false, name = "userId")
private UserDetails user;

I have tried

query = session.createQuery("from Tasks as tasks inner join tasks.filedTasks as files with files.user = :user");
query.setParameter("user", user); //user is UserDetails instance

But I am getting error clause can only reference columns in the driving table, means FiledTask can’t userId for comparision?

with clause can only reference columns in the driving table [from com.akhi.app.cdm.Tasks as tasks inner join tasks.filedTasks as files with files.user = :user]

Answer 1

If you want the FiledTasks of a given user, then the easiest thing to do is

UserDetails user = session.find(UserDetails.class, userId);
Collection<FiledTask> filesTasks = user.getFiledTasks();

Using HQL, it would be

select f from FiledTask f where f.user = :user

If what you want is in fact the tasks of a given user, then the query would simply be

select t from Tasks t
inner join t.filedTasks filedTask
where filedTask.user = :user

Note that the entity Tasks shouldbe named Task. An instance represents a single task, and not multiple ones.