Hi,

I have a class called "A" which I wanna map to table called "xyz". Can I name my .hbm.xml file as "b.hbm.xml"? I tried this but it gives me error.
Any reason for this because in Hibernate http://www.hibernate.org/hib_docs/v3/re ... orial.html
, they say "[b]The naming of mapping files can be arbitrary, however the hbm.xml suffix became convention in the Hibernate developer community"[/b].
Please try it at your end and let me know if this works for you.

Thanks
Medhavi.

First of all what was the error?

It may (probably) be completely unrelated to your naming.

The error was
[java] net.sf.hibernate.MappingException: Resource: Medhavi.hbm.xml not found
[java] at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:334)
[java] at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:1013)
[java] at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:969)
[java] at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:897)
[java] at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:883)
[java] at Main.main(Unknown Source)
[java] Exception in thread "main"
[java] Java Result: 1

And my Main.java file is:


import net.sf.hibernate.cfg.Configuration;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.Session;
import net.sf.hibernate.Transaction;
import net.sf.hibernate.MappingException;
import net.sf.hibernate.HibernateException;
import java.lang.Integer;

public class Main {
public static void main ( String[] args )
throws MappingException,
HibernateException
{

Integer i = new Integer(1);
System.out.println("Cfg. the initial values");
Configuration cfg = new Configuration();
//cfg.addClass( Medhavi.class );
SessionFactory sessions = cfg.configure().buildSessionFactory();
System.out.println("Cfg. ended");
Session session = sessions.openSession();
Transaction tx = null;
Medhavi kw = new Medhavi("k","blue" );
kw.setId(i);
System.out.println("Inserted keyword in database Medhavi");
try {
tx = session.beginTransaction();
session.save( kw );
tx.commit();
System.out.println("TranX committed");
}
catch ( HibernateException he ) {
he.printStackTrace();
if ( tx != null ) tx.rollback();
throw he;
}
finally {
session.close();

sessions.close() ;

System.out.println("Session closed");

}
}
}


Mapping file:Keyword.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<!-- table created by: CREATE TABLE KEYWORDS ( ID IDENTITY, NAME VARCHAR(25) ); -->
<class name="Medhavi"
table="employee2">
<id name="id" type="integer" column="id">
<generator class="increment"/>
</id>
<property name="id1" type="string" column="NAME" />
<property name="id2" type="string" column="NAME2" />
</class>

Thanks,
Medhavi

Do you have a file hibernate.cfg.xml containing the following line (among other lines of course)?


See the documentation for more information:
http://www.hibernate.org/hib_docs/refer ... tart-intro

Best regards
Sven

Thanks for the replyy.
Yes this mapping is there in hibernate.cfg.xml file.

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<hibernate-configuration>

<session-factory>

<!-- Database connection settings -->
<property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
<property name="connection.url">jdbc:hsqldb:data/medhavi</property>
<property name="connection.username">sa</property>
<property name="connection.password"></property>

<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>

<!-- SQL dialect -->
<property name="dialect">net.sf.hibernate.dialect.HSQLDialect</property>

<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">create</property>
<mapping resource="Keyword.hbm.xml"/>
<mapping resource="First.hbm.xml"/>

</session-factory>

</hibernate-configuration>

Thanks,
Medhavi.

You can name the files anything you want. But the generally accepted standard is to name them the same as your POJOs.

Are your mapping files in the root of your classpath ?

If they are nested alongside the Java classes in the package/directory structure, then you need to specify this as well.

<mapping resource="org/xyz/.../Keyword.hbm.xml" />

Are you sure that this is true for Hibernate 2 as well? I can only find this quote in the Hibernate 3 documentation.

Best regards
Sven

I'm pretty sure the only time naming matters(in either version) is if you're configuring the SessionFactory programatically.


The addClass(Class c) method does the following to identify the mapping file.

Sounds understandable, I just couldn't find the information in the 2.x documentation.

Best regards
Sven

Hi,

All mapping files are in my classpath and they are not embedded inside a package, still I am facing the same error. I guess may be its not true for 2.x. but then it is really nice to know that its a compulsion to follow the naming convention if we are using the addClass method. Thanks for this info.

Regards,
Medhavi.