HQL: illegal attempt to dereference collection

Question

The situation is like this:

I have an entity Book that holds a one-to-many relationship with Chapter.

Now if I try the query, \"from Book book inner jo

Answer 1

You can likely do this with a subquery.

Something like

from Book book where not exists (from chapter where 
                   chapter.title like '%hibernate%' and chapter.book = book)

(Not tested ...)

Answer 2

chapters is a collection in books and so will not hold the property title (Collection.title). You need to join the chapters in order to include them in your query like your first example. If your chapters are mapped lazily you will only get a collection of Book's without the chapters loaded in them. So I would say, use your first query.

For further reading, have a look at the query HQL joins and performance fetching pages.