Can't obtain Primary Key value by JPQL

[Alex, Huang]

Hi everybody,

I am using openJPA2.0.1 + Mysql5.1.

Table definition like below,
===============DML START=======================
CREATE TABLE t_user (
  uid int(10) unsigned NOT NULL AUTO_INCREMENT,
  name varchar(255) DEFAULT NULL,
  age int(11) NOT NULL,
  PRIMARY KEY (uid)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
===============DML END=========================

entity,
==========Entity START=========================
@Entity
@Table(name="t_user")
public class TUser implements Serializable {
 private static final long serialVersionUID = 1L;

 @Id
 @GeneratedValue(strategy=GenerationType.IDENTITY)
 @Column(insertable=false)
 private int uid;

 private int age;

 private String name;
 ......getter and setter.....
==========Entity END===========================

==========persistence.xml START===========================
................
  <class>entity.TUser</class>
  <properties>
   <property name="openjpa.jdbc.DBDictionary" value="mysql"/>
   <property name="javax.persistence.jdbc.driver" 
value="com.mysql.jdbc.Driver"/>
   <property name="javax.persistence.jdbc.url" 
value="jdbc:mysql://localhost:3306/test?characterEncoding=utf8"/>
   <property name="javax.persistence.jdbc.user" value="root"/>
   <property name="javax.persistence.jdbc.password" value="xxxxxx"/>
   <property name="openjpa.Log" value="DefaultLevel=WARN, Runtime=INFO, 
Tool=INFO, SQL=TRACE"/>
  </properties>

==========persistence.xml END=============================


I run a JPQL like below,

Query query = em.createQuery("SELECT user FROM TUSER user");

For the result, I can get each field's value except primary key field. In 
this case, each entity's uid field is zero.

I tried to trace the source code and I found the following code in 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager from LINE 1085.

        // load unloaded fields
        FieldMapping[] fms = mapping.getDefinedFieldMappings();
        Object eres, processed;
        for (int i = 0; i < fms.length; i++) {
            if (fms[i].isPrimaryKey() || 
sm.getLoaded().get(fms[i].getIndex()))
                continue;

It seemed that if the a field is primary key so no value would be passed to 
it. Would someone tell me why?  Did I miss any setting?

Thanks and best regards,
Alex, Huang