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Tried to convert a very little testprogram from 2.1 to 3.02. Although the program runs and gives correct output, the console shows following message. Whats wrong ?

Full stack trace of any exception that occurs:

ay 6, 2005 9:10:22 PM org.hibernate.proxy.CGLIBLazyInitializer getProxyFactory
SEVERE: CGLIB Enhancement failed: Message
java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at net.sf.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:682)
at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:494)
at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:215)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:373)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:281)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:640)
at org.hibernate.proxy.CGLIBLazyInitializer.getProxyFactory(CGLIBLazyInitializer.java:94)
at org.hibernate.proxy.CGLIBProxyFactory.postInstantiate(CGLIBProxyFactory.java:42)
at org.hibernate.tuple.PojoTuplizer.buildProxyFactory(PojoTuplizer.java:144)
at org.hibernate.tuple.AbstractTuplizer.<init>(AbstractTuplizer.java:83)
at org.hibernate.tuple.PojoTuplizer.<init>(PojoTuplizer.java:54)
at org.hibernate.tuple.TuplizerLookup.create(TuplizerLookup.java:47)
at org.hibernate.tuple.EntityMetamodel.<init>(EntityMetamodel.java:217)
at org.hibernate.persister.entity.BasicEntityPersister.<init>(BasicEntityPersister.java:400)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:104)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:207)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1055)
at HelloHibernate.main(HelloHibernate.java:27)
May 6, 2005 9:10:22 PM org.hibernate.tuple.PojoTuplizer buildProxyFactory
WARNING: could not create proxy factory for:Message
org.hibernate.HibernateException: CGLIB Enhancement failed: Message
at org.hibernate.proxy.CGLIBLazyInitializer.getProxyFactory(CGLIBLazyInitializer.java:108)
at org.hibernate.proxy.CGLIBProxyFactory.postInstantiate(CGLIBProxyFactory.java:42)
at org.hibernate.tuple.PojoTuplizer.buildProxyFactory(PojoTuplizer.java:144)
at org.hibernate.tuple.AbstractTuplizer.<init>(AbstractTuplizer.java:83)
at org.hibernate.tuple.PojoTuplizer.<init>(PojoTuplizer.java:54)
at org.hibernate.tuple.TuplizerLookup.create(TuplizerLookup.java:47)
at org.hibernate.tuple.EntityMetamodel.<init>(EntityMetamodel.java:217)
at org.hibernate.persister.entity.BasicEntityPersister.<init>(BasicEntityPersister.java:400)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:104)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:207)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1055)
at HelloHibernate.main(HelloHibernate.java:27)
Caused by: java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at net.sf.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:682)
at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:494)
at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:215)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:373)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:281)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:640)
at org.hibernate.proxy.CGLIBLazyInitializer.getProxyFactory(CGLIBLazyInitializer.java:94)
... 12 more

Name and version of the database you are using:

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt: