Hi!

What we have:
Stateless session beans exposed as webservices on
jboss 4.0.1SP1 . We are going to deploy in a clustered
environment with high performance requirements.

The questions:
Should we use hibernate with full relational mapping
or just mapp single classes to tables without relations?

When we have full relational mapping we use lazy loading
but it feels like a lot of unnessecary work to get a whole
object just to get an ID.

Since we are going to use caching and clustering isnt
that a performance risk since the cache has to be
distributed?

Any hints, tips on performance when using webservices
and hibernate in a clustered environment...

Thanks in advance
/Per

You need to remember that if the mapped entities are truly set to be lazy, then:

is a little misleading. What actually happens is that Hibernate generates a proxy for these entity instances; they know about their PK value, but none of the other data has been loaded from the database (until you actually try to access it). Calling myEntity.getId() *does not* force Hibernate to load the entity from the database (remember that the constructed proxy already knows about its id value).

HTH