Can I use a java primitive type for id in my persistent classes. ("int" for example) ?

If yes, the Session.load metho needs a Serializable object as id value, can I use the java.lang.Integer class even if my class memeber is a primitive "int"? As this: session.load(clazz, new Integer(id));

Other thing: I have a problem which may be linked with my previous question: at the beginning af my application, I got this exception:
net.sf.hibernate.MappingException: Error reading resource
...
Caused by: net.sf.hibernate.MappingException: invalid mapping
...
Caused by: org.xml.sax.SAXParseException: The content of element type "id" must match "(meta*,column*,generator

I have a very very simple mapping:
<hibernate-mapping>
<class name="test.Entity" table="Entities">
<id name="id" type="int" unsaved-value="0">
<generator class="native"/>
</id>
<property name="name" type="string"/>
</class>
</hibernate-mapping>

Please help :(
I don't find the problem for the exception :(

Concerning the SaxParser Exception: if i modify the example provided with hibernate (eg folder), adding addClass(Entity.class); i get no exception and the class is well mapped??? Why it fails in my own classes?
(I copied the hibernate.properties and the log4j.properties)

Ok i found the problem for the exception... In my project i used another version of xerces... so the old one was used instead of the one provided with hibernate libs...

Now let's talk about my first question "Can I use a java primitive type for id in my persistent classes. ("int" for example) ? " ...

Concerning the id: as you can read in the ref guide (4.1.3) it's better to use a nullable object for identifiers (like java.lang.Long). I always use Long and it works good!

Gio