Hi, i have a problem with my path on org.hibernate.tool.ant.HibernateToolTask,
Here are the Exception and config files.

[hibernatetool] An exception occurred while running exporter #2:hbm2ddl (Generates database schema)
[hibernatetool] To get the full stack trace run ant with -verbose
[hibernatetool] Problems in creating a configuration for JPA. Have you remembered to add hibernate EntityManager jars to the classpath ?
[hibernatetool] java.lang.reflect.InvocationTargetException
[hibernatetool] javax.persistence.PersistenceException: [PersistenceUnit: junit] Unable to configure EntityManagerFactory
[hibernatetool] org.hibernate.AnnotationException: No identifier specified for entity: org.dbsoft.modelo.Usuario
[ant] Exiting /home/diego/workspace/OpenXava/build.xml.

BUILD FAILED
/home/diego/workspace/Sas/build.xml:38: The following error occurred while executing this line:
/home/diego/workspace/OpenXava/build.xml:982: Problems in creating a configuration for JPA. Have you remembered to add hibernate EntityManager jars to the classpath ?

######################################

<target name="defineHibernateTool">
<path id="jpatoolslib">
<path location="../OpenXava/lib/hibernate-tools.jar" />
<path location="../OpenXava/lib/freemarker.jar" />
<path location="../OpenXava/lib/commons-logging.jar" />
<path location="../OpenXava/lib/hibernate-entitymanager.jar" />
<path location="../OpenXava/lib/ejb3-persistence.jar" />
<path location="../OpenXava/lib/javaassist.jar" />
<path location="${jdbc.driver.jar}" />

<!-- Library from OpenXava in order to work the first time
before WEB-INF/lib of new project is populated -->
<fileset dir="../OpenXava/web/WEB-INF/lib">
<include name="**/*.jar"/>
</fileset>
<!-- Library of project to include custom libraries -->
<fileset dir="../${project}/web/WEB-INF/lib">
<include name="**/*.jar"/>
</fileset>
<path location="../OpenXava/bin" />
<path location="${schema.path}" />
</path>

<taskdef name="hibernatetool"
classname="org.hibernate.tool.ant.HibernateToolTask"
classpathref="jpatoolslib" />
</target>

I feel like I had googled the whole internet without finding what I want. please help me out.

This is not a problem with your classpath.

[hibernatetool] org.hibernate.AnnotationException: No identifier specified for entity: org.dbsoft.modelo.Usuario

Make sure you add the @Id annotation to your primary key field.

ups , I have posted in wrong thread..