Wrong Select statement being generated

Question

The problem is to do with querying an object (db table) in an inheritance. The main comment is at the end.
A. Here is the base class:
@javax.persistence.Table(name = "DATA_PROFILE", schema="LPDS")
@javax.persistence.Entity
@javax.persistence.Inheritance(     strategy = javax.persistence.InheritanceType.JOINED)
@javax.persistence.DiscriminatorColumn(name="DOMAIN_TYPE" , discriminatorType=javax.persistence.DiscriminatorType.STRING)
public abstract class DataProfileEntity implements java.io.Serializable{
B. And here is the sub class being queried:
@javax.persistence.Table(name = "DATA_CONSTRAINT", schema="LPDS")
@javax.persistence.Entity
@javax.persistence.DiscriminatorValue("DataConstraint")
@javax.persistence.PrimaryKeyJoinColumn(name="ID", referencedColumnName="ID")
public class DataConstraintEntity extends DataProfileEntity implements java.io.Serializable, Cloneable{
C. Here is my DAO using the Eclipselink API:
@javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.NOT_SUPPORTED)
public java.util.Collection<T> queryByExample(T entity) {
     if (type == null) {
          throw new UnsupportedOperationException("The type must be set to use this method.");
     if (entity == null) {
throw new java.lang.NullPointerException(DAOExceptionMessageBuilder.buildMessage("param.value.empty", new Object[] { entity}));
     try{
ReadAllQuery readAllQuery = new ReadAllQuery(type);
readAllQuery.setExampleObject(entity);
return (java.util.Collection<T>) getUnitOfWork().executeQuery(readAllQuery);
} catch (org.eclipse.persistence.exceptions.DatabaseException dbe) {
dbe.printStackTrace();
throw new DAOException(DAOExceptionMessageBuilder.buildMessage("object.find.exception"), dbe);
} catch (java.lang.RuntimeException rte) {
rte.printStackTrace();
throw new DAOException(DAOExceptionMessageBuilder.buildMessage("object.find.exception"), rte);
D: When I do the following:
     DataConstraintEntity entity = new DataConstraintEntity();
     entity.setParentTable("User");
     entity.setCrudMode("All");
dao.queryByExample(entity);
The log message shows the following:
2009-11-20 20:43:11,671 INFO [STDOUT] (http-127.0.0.1-8080-1) Begin profile of{ReadAllQuery(referenceClass=DataConstraintEntity )
2009-11-20 20:43:11,689 INFO  [STDOUT] (http-127.0.0.1-8080-1) [EL Fine]: 2009-11-20 20:43:11.68--ServerSession(25760263)--Connection(32815217)--Thread(Thread[http-127.0.0.1-8080-1,5,jboss])
--SELECT t0.ID, t0.DOMAIN_TYPE, t0.IS_LOCKOUT, t0.VERSION, t0.UPDATED_BY, t0.HITS, t0.CREATED_BY, t0.DESCRIPTION, t0.NAME, t0.DATE_LAST_UPDATED, t0.DATE_CREATED, t0.NOTES, t0.owner, t1.ID, t1.DATA_TYPE, t1.READ_ONLY, t1.ENABLED_ON_USER_ROLE, t1.RENDERED_ON_USER_ROLE, t1.CRUD_MODE, t1.PARENT_TABLE, t1.DATA_NAME FROM ODMS.DATA_PROFILE t0, ODMS.DATA_CONSTRAINT t1 WHERE ((((t0.DOMAIN_TYPE = ?) AND (t1.CRUD_MODE = ?)) AND (t1.PARENT_TABLE = ?)) AND ((t1.ID = t0.ID) AND (t0.DOMAIN_TYPE = ?)))
     bind => [DataProfile, All, User, DataConstraint]
2009-11-20 20:43:12,412 INFO [STDOUT] (http-127.0.0.1-8080-1) Profile(ReadAllQuery,
     class=com.xoftsystems.odms.domain.bean.DataConstraintEntity,
     total time=736,
     local time=736,
     profiling time=1,
     connect=1,
     logging=10,
     query prepare=5,
     sql prepare=1,
     sql execute=716,
     sql generation=3,
}End profile
In "bind => [DataProfile, All, User, DataConstraint]", I don't know why Eclipselink is passing "DataProfile" as a value to the query or even why the two "(t0.DOMAIN_TYPE = ?)" in the statement. t0.DOMAIN_TYPE cannot be "t0.DOMAIN_TYPE = 'DataProfile'" and "t0.DOMAIN_TYPE = 'DataConstraint'". It should only be "t0.DOMAIN_TYPE = 'DataConstraint'".
Testing the above Select statement directly on my database fails but succeeds when I remove the first "(t0.DOMAIN_TYPE = ?)" and run it.
Questions:
1. Could this be a bug in Eclipselink?
2. How do I get rid of the first "(t0.DOMAIN_TYPE = ?)" in the Select statement?
3. What am I doing wrong?
Thanks in advance.

Answer 1

Hello,
First question should really be where is the "'DataProfile" DOMAIN_TYPE value coming from? I don't see a descriminatorValue annotation set with this value, so do you have it set through a mapping some where?
Best Regards,
Chris