How can I avoid the Warning “firstResult/maxResults specified with collection fetch; applying in memory!” when using Hibernate?

Question

I\'m getting a warning in the Server log \"firstResult/maxResults specified with collection fetch; applying in memory!\". However everything working fine. B

Answer 1

I guess the emp has many departments which is a One to Many relationship. Hibernate will fetch many rows for this query with fetched department records. So the order of result set can not be decided until it has really fetch the results to the memory. So the pagination will be done in memory.

If you do not want to fetch the departments with emp, but still want to do some query based on the department, you can achieve the result with out warning (without doing ordering in the memory). For that simply you have to remove the "fetch" clause. So something like as follows:

QUERY = "from employee as emp left join emp.salary sal left join emp.department dep where emp.id = :id and dep.name = 'testing' and sal.salary > 5000 "