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JavaRanch » Java Forums » Databases » Object Relational Mapping
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Mapping Exception

kranthi chamarthi
Ranch Hand

Joined: May 08, 2007
Posts: 95
I am trying to do a many-to-many association using hibernate. I am having an
EVENT table and PERSON table. I am trying to get many-to-many association between these two tables using a junction table PERSON_EVENT. Following is the
mapping xml


Now when i tried to run the program i am getting the following exception
org.hibernate.MappingException: An association from the table PERSON_EVENTS refers to an unmapped class: EVENT

Can anyone suggest me how to solve this.
Paul Sturrock
Bartender

Joined: Apr 14, 2004
Posts: 10336

You probably don't have your EVENT mapping listed in your configuration. If you are using hibernate.cfg.xml have you included the event mapping?


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kranthi chamarthi
Ranch Hand

Joined: May 08, 2007
Posts: 95
Yeah i included the Event mapping in my hibernate.cfg.xml
Follwing is the configuration xml

and following is the event hbm xml
Paul Sturrock
Bartender

Joined: Apr 14, 2004
Posts: 10336

You included a mapped resource called "Event". Your mapping from Person is to a mapped resource called EVENT.

Remember, Java is case-sensitive.
kranthi chamarthi
Ranch Hand

Joined: May 08, 2007
Posts: 95
You are right Paul...Thank you very much.
Ajay Luthria
Greenhorn

Joined: Jul 15, 2009
Posts: 5
Paul Sturrock wrote:You included a mapped resource called "Event". Your mapping from Person is to a mapped resource called EVENT.

Remember, Java is case-sensitive.

Hi Paul,
I am having the same problem and after reading your reply tried to solve it but comes up with the error:
n association from the table PERSON_EVENT refers to an unmapped class: Event



<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/test</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">bhuru</property>
<property name="hibernate.connection.pool_size">10</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.hbm2ddl.auto">update</property>

<!-- Mapping files -->
<mapping resource="Event.hbm.xml"/>
<mapping resource="Person.hbm.xml"/>


</session-factory>
</hibernate-configuration>

Person.hbm.xml
------------------
<hibernate-mapping>
<class name="Person" table="PERSON">

<id name="id" column="PERSON_ID">
<generator class="native"/>
</id>

<property name="firstName"/>

<set name="events" table="PERSON_EVENT">
<key column="PERSON_ID"/>
<many-to-many column="EVENT_ID" class="Event"/>
</set>

</class>
</hibernate-mapping>

Event.hbm.xml
------------------

<hibernate-mapping>


<class name="hibernate.Event" table="EVENT">

<id name="id" column="EVENT_ID">
<generator class="native"/>
</id>

<property name="date" type="timestamp" column="EVENT_DATE"/>
<property name="title"/>





</class>


</hibernate-mapping>



I would genuinely appreciate any help.
 
 
subject: Mapping Exception