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endcrash
 Post subject: problem with Hibernate3 <join>
PostPosted: Tue Oct 26, 2004 2:33 pm 
Newbie

Joined: Mon Oct 25, 2004 5:21 pm
Posts: 6
Hibernate version:
3.0 (latest from cvs)

Mapping documents:

ObjectItem.hbm.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping
   PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package = "com.acs.crom">

   <class name="ObjectItem" table="obj_item">

      <!-- unique ID for class -->
      <id name="id" type="java.lang.Long" unsaved-value="null">
         <column name="obj_item_id" sql-type="bigint(15)" not-null="true"/>
         <generator class="native"/>
      </id>
      
      <discriminator column="cat_code" type="string"/>

      <!-- protected String categoryCode -->
      <property name="categoryCode" type="java.lang.String" insert="false" update="false">
         <column name="cat_code" sql-type="varchar(6)"/>
      </property>
      
      <!-- protected String name -->
      <property name="name" type="java.lang.String">
         <column name="name" sql-type="varchar(100)"/>
      </property>

      <!-- protected String alternateName -->
      <property name="alternateName" type="java.lang.String">
         <column name="alt-identific_txt" sql-type="varchar(255)"/>
      </property>
      
      <!-- protected ObjectStatus status -->
      <many-to-one name="status" class="ObjectStatus" insert="false" update="false" cascade="all">
         <column name="obj_item_id"/>
      </many-to-one>
      
      <!-- protected ObjectItemLocation objectItemLocation -->
      <many-to-one name="objectItemLocation" class="ObjectItemLocation" insert="false" update="false" cascade="all">
         <column name="obj_item_id"/>
      </many-to-one>
      
      <!-- join with obj_item_type -->
      <join table="obj_item_type">

         <key column="obj_item_id"/>
      
         <!-- protected ObjectType type -->   
         <many-to-one name="type" class="ObjectType" cascade="all">
            <column name="obj_type_id"/>
         </many-to-one>
         
      </join>
      
      <!-- join with obj_item_capab -->
      <join table="obj_item_capab">
         
         <key column="obj_item_id"/>
         
         <!-- protected Capability capability -->
         <many-to-one name="capability" class="Capability" cascade="all">
            <column name="capab_id"/>
         </many-to-one>
         
      </join>

   </class>

</hibernate-mapping>


Feature.hbm.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping
   PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package = "com.acs.crom">

   <subclass name="Feature"  extends="com.acs.crom.ObjectItem" discriminator-value="FE">

      <join table="feat">
         
         <!-- links id back to superclass -->
         <key column="feat_id"/>
      
         <!-- protected String featureCategoryCode -->
         <property name="featureCategoryCode" type="java.lang.String">
            <column name="cat_code" sql-type="char(6)"/>
         </property>
         
      </join>

   </subclass>

</hibernate-mapping>


Code between sessionFactory.openSession() and session.close():
N/A

Full stack trace of any exception that occurs:
Code:
13:39:28,732 ERROR SessionManager:34 - Initial SessionManager creation failed.
org.hibernate.MappingException: Repeated column in mapping for class com.acs.crom.Feature should be mapped with insert="false" update="false": cat_code
   at org.hibernate.persister.BasicEntityPersister.checkColumnDuplication(BasicEntityPersister.java:2283)
   at org.hibernate.persister.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:300)
   at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:44)
   at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:184)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:942)
   at com.acs.hibernate.SessionManager.<clinit>(SessionManager.java:32)
   at com.acs.bml.impl.HibernateLoadTest.main(HibernateLoadTest.java:25)
java.lang.ExceptionInInitializerError
   at com.acs.hibernate.SessionManager.<clinit>(SessionManager.java:35)
   at com.acs.bml.impl.HibernateLoadTest.main(HibernateLoadTest.java:25)
Caused by: org.hibernate.MappingException: Repeated column in mapping for class com.acs.crom.Feature should be mapped with insert="false" update="false": cat_code
   at org.hibernate.persister.BasicEntityPersister.checkColumnDuplication(BasicEntityPersister.java:2283)
   at org.hibernate.persister.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:300)
   at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:44)
   at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:184)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:942)
   at com.acs.hibernate.SessionManager.<clinit>(SessionManager.java:32)
   ... 1 more
Exception in thread "main"


Name and version of the database you are using:
mySQL ver 12.22 distrib 4.0.21

The generated SQL (show_sql=true):
N/A

Debug level Hibernate log excerpt:
N/A


I am trying to map a complex database to a fairly different object model, and have needed to use the hibernate3 <join> tag frequently. It has been working well, up until this problem. Feature, a subclass of ObjectItem, joins the obj_item table to the feat table. The problem seems to be that each table has a cat_code field. Thus, when I map the cat_code field in the feat table, an error message states that this is a repeat mapping, when the only other time cat_code is referred to is in the obj_item table. It seems to me that hibernate is confusing the two. I don't know if the fact that cat_code in obj_item is a discriminator has something to do with this problem or not. I am not sure if I have caught a bug in hibernate3, or if I am doing something wrong. I know this is an ugly mapping, but unfortunately it needs to be done. Any help would be greatly appreciated.

Thanks,
Jeff
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michael
 Post subject:
PostPosted: Tue Oct 26, 2004 2:38 pm 
Hibernate Team
Hibernate Team

Joined: Tue Sep 09, 2003 2:10 pm
Posts: 3246
Location: Passau, Germany
Creating a JIRA entry for this in the Hibernate3 subproject would be good. - this might be a bug
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endcrash
 Post subject:
PostPosted: Tue Oct 26, 2004 3:08 pm 
Newbie

Joined: Mon Oct 25, 2004 5:21 pm
Posts: 6
I created a JIRA entry, any additional help would be great.

also, I noticed that the hibernate3 DTD does not allow a joined-subclass to use the <join> tag. I am guessing this is a design decision, as it doesn't seem necessary (although could, in some cases, make mappings easier), but I wanted to confirm this this was the case.
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