Good afternoon in my timezone.

I already had seen on post here in this forum similar to my question , but the answer don't correct my problem.

First of all i'm new in hibernate, and i'm trying to learn JPA to.
I'm reading the "java persistence with hibernate" book and doing the first exercise "Hello World" persisting the messages objects.
the build.xml file have the follow taskdef and target :

<taskdef name="hibernatetool"
classname="org.hibernate.tool.ant.EnversHibernateToolTask"
classpathref="classpath"/>

<target name="schemaexport" depends="build, copymetafiles"
description="Exports a generated schema to DB and file">
<hibernatetool destdir="${basedir}">
<classpath path="${build}"/>
<configuration configurationfile="${build}/hibernate.cfg.xml"/>
<hbm2ddl

update = "true"
create="true"
export="true"
outputfilename="message-ddl.sql"
delimiter=";"
format="true"/>
</hibernatetool>
</target>

when i run this in the command-line it throws the following error:
Taskdef A class needed by class org.hibernate.tool.ant.EnversHibernateToolTask cannot be found org/hibernate/tool/ant/HibernateToolTask

I think this class is defined in the hibernate-tools.jar, i had download hibernate-distribution-3.6.4.Final-dist.zip file but within this zip there is no such jar.
I already have seen post talking about a plugins folder , saying that the jar is in this folder , but there is no such folder to inside that zip.
1) So where i can get this hibernate-tools.jar ?
2)Is the hibernate-tools.jar necessary, am i doing something wrong ?

I am a little desperate because i can not advance with that.

With the best regards.