hi,
I have an application using the the following ant script (it creates mapping files - hbms and sql schema for my database, basing on xdoclet for hibernate), (application also use spring beans in configuration file):
Code:
<?xml version="1.0" encoding="UTF-8"?>
<project name="demo" default="generate">

	<property file="build.properties" />

	 <target name="init">

	 	<echo message="Clening..."/>
	 	<delete dir="target" failonerror="false"/>

	 	<echo message="Creating folders..."/>
        <mkdir dir="target"/>
        <mkdir dir="target/classes"/>
        <mkdir dir="target/jar"/>

	 	<echo message="Defining xdoclet2 ant task..."/>
        <path id="xdoclet2.task.classpath">
            <fileset dir="lib/xdoclet">
                <include name="*.jar"/>
            </fileset>
        </path>

        <path id="project.classpath">
            <fileset dir="lib">
                <include name="*.jar"/>
            </fileset>
        </path>

        <taskdef
            name="xdoclet2"
            classname="org.xdoclet.ant.XDocletTask"
            classpathref="xdoclet2.task.classpath"
            />
    </target>
	<target name="generate" depends="init" description="Cleans and builds everything.">
	 	<echo message="Generating hbms..."/>
        <xdoclet2>
            <fileset dir="source/src">
                <include name="**/*Model.java"/>
            </fileset>

            <component
                classname="org.xdoclet.plugin.hibernate.HibernateMappingPlugin"
                destdir="target/hbm"
                version="2.0"
                />
        </xdoclet2>

	 	<echo message="Compiling..."/>
		<javac classpathref="project.classpath" destdir="target/classes"
			srcdir="source/src">
		</javac>

	 	<echo message="Creating jar..."/>
		<jar destfile="target/jar/demo.jar">
			<fileset dir="target/classes"/>
			<fileset dir="resources"/>
			<fileset dir="target/hbm"/>
		</jar>

        <path id="hibernate.task.classpath">
            <fileset dir="lib">
                <include name="*.jar"/>
            </fileset>
            <fileset dir="target/jar">
                <include name="*.jar"/>
            </fileset>
        </path>

	 	<echo message="Creating database schema..."/>
    	<taskdef name="schemaexport"
    	     classname="net.sf.hibernate.tool.hbm2ddl.SchemaExportTask"
    	     classpathref="hibernate.task.classpath"/>

	   	 <schemaexport
	   	     properties="resources/hibernate.properties"
	   	     quiet="no"
	   	     text="no"
	   	     drop="no"
	   	     delimiter=";"
	   	     output="target/schema-export.sql">
	   	     <fileset dir="target/hbm">
	   	         <include name="**/*.hbm.xml"/>
	   	     </fileset>
	   	 </schemaexport>

	</target>

</project>


EXAMPLE MAPPING FILE:
Code:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
  <class table="DEMO_ADDRESS" name="amg.demo.model.AddressModel">
    <id unsaved-value="null" name="id">
      <generator class="native">
        <param name="sequence">id_seq</param>
      </generator>
    </id>
    <version unsaved-value="undefined" name="version" column="version" type="java.lang.Long"/>
    <property name="firstName"/>
    <property name="lastName"/>
    <property name="type" type="amg.demo.model.AddressTypeEnum"/>
    <property name="zipCode"/>
  </class>
</hibernate-mapping>
I wish I would know how to make an inverse operation - I mean having the sql database schema I should generate classes and propably the mapping xml-es.

Could u please give me some example applications/ant or maven scripts with some database sql schemat or some not very complicated links to the tutorials concerning this problem?