class User {
   private long id;
   private String name;

   public long getId() {
       return id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }
}

<class name="User" table="USERS">
   <id name="id" column="ID" type="long" access="field">
       <generator class="increment" />
   </id>
   <property name="name" column="USER_NAME" not-null="true"
unique="true" />
</class>

As you can see the ID field has no setter. By setting the 'access'
method to 'field' you can tell hibernate to work directly on the field
instead of using the get/set method. The getter method can also be
removed of course, but most of the time doesn't make sense to remove
the getter in real life code (except when a field is only to be used in
internal calculations).

Regards,

Bart

With Hibernate Annotations, annotating the field rather than the mutator
methods implies field access.