I have been looking net.sf.hibernate.tool.hbm2java.Hbm2JavaTask in
org.hibernate.tool.hbm2ddl, but it is not there

I was thinking that if there is any other calass instead of Hbm2JavaTask

I may not entirely understand your question, but is this what you're looking for?

Eric

I am trying to run an example from a book which was mad for hibernate2.x. I am currently running hibernate 3.0. Inside the build.xm file the have defined the following code.

<!-- Teach Ant how to use Hibernate's code generation tool -->
<taskdef name="hbm2java"
classname="net.sf.hibernate.tool.hbm2java.Hbm2JavaTask"
classpathref="project.class.path"/>

<!-- Generate the java code for all mapping files in our source tree -->
<target name="codegen" depends="prepare"
description="Generate Java source from the O/R mapping files">
<hbm2java output="${source.root}">
<fileset dir="${source.root}">
<include name="**/*.hbm.xml"/>
</fileset>
</hbm2java>
</target>

which generates java source from a mapping file (*.hbm.xml)

In taskdef the have defined classname "net.sf.hibernate.tool.hbm2java.Hbm2JavaTask" and hbm2java.Hbm2JavaTask class does not exist in hibernate 3.0. I was wandereing if there is an alternate class that does the same job.

I downloaded that alpha version of HibernateTools. Although mostly advertised for its new interactive capabilities, it also contains the traditional ant tools. The class to invoke is org.hibernate.tool.ant.HibernateToolTask