Using XDoclet 1.2.1 you may create a configuration file by using the
nested Element "hibernatecfg" of the "hibernatedoclet" task.

Example:

<target name="hibernate.mappings" description="creates hibernate mapping
files and hibernate config file">
<hibernatedoclet
    excludedtags="@version,@author,@todo"
    destdir="${basedir}"
    mergedir="${basedir}"
    force="false"
    verbose="true">

    <fileset dir="${basedir}">
        <include name="**/*.java"/>
    </fileset>

    <hibernate  version="2.0"/>
	
    <hibernatecfg
        dialect="net.sf.hibernate.dialect.MySQLDialect"
        driver="com.mysql.jdbc.Driver"
        jdbcUrl="jdbc:mysql:///${database.name}"
        userName="hibernate"
        password="aPassword"/>
</hibernatedoclet>
</target>