I got the following error when I try to extract POJOs from an existing MYSQL database using Reverse Engineer ant build from Hibernate tool.

I am using the following jar files:
Hibernate3.jar - v3.5.0
Hibernate Tool v3.2.4
mysql-connector-java-5.0.5.jar
eclipse 3.4.0

What version of hibernate engine should I use in this case?

java.lang.IncompatibleClassChangeError: Found interface org.hibernate.cfg.Mappin
gs, but class was expected
at org.hibernate.cfg.JDBCBinder.createPersistentClasses(JDBCBinder.java:
134)
at org.hibernate.cfg.JDBCBinder.readFromDatabase(JDBCBinder.java:95)
at org.hibernate.cfg.JDBCMetaDataConfiguration.readFromJDBC(JDBCMetaData
Configuration.java:42)
at org.hibernate.tool.ant.JDBCConfigurationTask.doConfiguration(JDBCConf
igurationTask.java:83)
at org.hibernate.tool.ant.ConfigurationTask.getConfiguration(Configurati
onTask.java:55)
at org.hibernate.tool.ant.HibernateToolTask.getConfiguration(HibernateTo
olTask.java:302)
at org.hibernate.tool.ant.HibernateToolTask.getProperties(HibernateToolT
ask.java:318)
at org.hibernate.tool.ant.ExporterTask.configureExporter(ExporterTask.ja
va:94)
at org.hibernate.tool.ant.ExporterTask.execute(ExporterTask.java:39)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.ja
va:186)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.jav
a:106)
at org.apache.tools.ant.Task.perform(Task.java:348)

thanks,
sis