I'm getting a NoClassDefFoundError exception when building sessino factory

13:48:14,887 [http-8080-Processor24 com.ecredit.ecdata.util.HibernateUtil] exception caught while instantiating session factory
java.lang.NoClassDefFoundError
at org.hibernate.tuple.EntityMetamodel.class$(EntityMetamodel.java:41)
at org.hibernate.tuple.EntityMetamodel.<init>(EntityMetamodel.java:122)
at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:412)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:108)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:215)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1154)


what could be the problem?
thanks,

You probably don't have all of the required jar files on your classpath.

Check out the list of needed libraries in section 1.2 of the introduction (http://www.hibernate.org/hib_docs/v3/reference/en/html/tutorial.html#tutorial-firstapp)

Also, see the FAQ here: http://hibernate.org/116.html#A2

thanks, let me try.

[quote="berserker"]I'm getting a NoClassDefFoundError exception when building sessino factory

I think ur using Hibernate Util class i.e provided under Hibernate reference manual while creating session factory.

if ur following the above ,
u should follow the below u should solve ur probelm.
U can place Hibernate Util class Under a Package.

example:-
<code>
package my.pack;
import org.hibernate.*;
import org.hibernate.cfg.*;

public class HibernateUtil {

private static Log log = LogFactory.getLog(HibernateUtil.class);

private static final SessionFactory sessionFactory;

static {
try {
// Create the SessionFactory
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
log.error("Initial SessionFactory creation failed.", ex);
throw new ExceptionInInitializerError(ex);
}
}

public static final ThreadLocal session = new ThreadLocal();

public static Session currentSession() {
Session s = (Session) session.get();
// Open a new Session, if this Thread has none yet
if (s == null) {
s = sessionFactory.openSession();
session.set(s);
}
return s;
}

public static void closeSession() {
Session s = (Session) session.get();
if (s != null)
s.close();
session.set(null);
}
}
</code>

compile the above program by using >
after setting the classpath to all required jar files and ur current working directory.
and the issue javac -d . HibernateUtil.java

Stop spreading this out-of-date HibernateUtil, it is not necessary, and the simple 5-line version provided in the first chapter of the Hibernate reference documentation works perfectly.