Question

I have hibernate database with three model:

Article - which has is part of multiple categories (EDIT).
Category - which contains articles, and is part of an App
App - which has different categories

I want to select all articles which have a category of a specific app.
So I am trying to create something like:

find("ANY categories.app = ?", app).fetch();

Something like this worked for me with CoreData, but obvious not with JPA, and I don’t seem to be able to find how to do this.

Edit:
To clarify:
in Articles:

    @ManyToMany
    public List<Category> categories;

in Category:

    @ManyToOne
    public App app;

    @ManyToMany(mappedBy = "categories")
    public List<Article> articles;

in App:

    @OneToMany(mappedBy = "app")
    public List<Category> categories;

Answer 1

select a from Article a where a.category.app = ?

Read http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html_single/#queryhql