hibernate.cfg.xml collection-cache collection

tartuffo · **Joined:** Fri Apr 30, 2004 12:32 pm **Posts:** 3

Could someone please explain to me the syntax of the collection attribute in the collection-cache element of hibernate.cfg.xml?

In my particular case, I've got a Department.hbm.xml which has:

Code:

    <set
        name="personnels"
        lazy="true"
        inverse="true"
    >
        <meta attribute="field-description">
           @hibernate.set
            lazy="true"
            inverse="true"

           @hibernate.collection-key
            column="department_id"

           @hibernate.collection-one-to-many
            class="model.Personnel"
        </meta>
        <key>
            <column name="department_id" />
        </key>
        <one-to-many 
            class="model.Personnel"
        />
    </set>

I want the per-dept collections of personnel to be cached (to maximize the speed of "Iterator pitr = dept.getPersonnels().iterator();". I tried putting the following in hibernate.cfg.xml:

Code:

        <collection-cache collection="model.Department" usage="read-write"/>
        <collection-cache collection="model.Personnel" usage="read-write"/>

But i get a null pointer exception at at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:1010).

I'm using Hibernate 2.1.

Any help would be greatly appreciated!

christian · **Posted:** Fri Apr 30, 2004 6:09 pm

use "model.Department.personell", the name of the cache region.

christian · **Posted:** Fri Apr 30, 2004 6:10 pm

"model.Department.personnels"