where (which layer) put entity query methods, "persist" methods etc.?

i have join app jpa/hibernate entities. i awe where put query, attention methods.

the default choice seems put event bean covering injected

@persistencecontext(...) @inject entitymanager entitymanager;

but i cruise i rather have methods entities themselves. pro's/con's?

1. testablity?


2. niceness?


3. performance?

and does anyone have links best practices interacting entitymanager etc. methods entities rather event beans?

best,
anders