Hey,
   ive been using middlegen to generate my mapping files. It works 
great. It generates a mapping for all the tables in my schema 
(approximately 20 tables) . Except when I added the following 
        <many2many>
            <tablea generate="true" name="MERCHANTS" /> 
            <jointable name="GROUPS_MERCHANTS" generate="false" /> 
            <tableb generate="true" name="GROUPS" /> 
         </many2many>

After I added this many-to-many restraint, all the other tables in my 
schema (except groups and merchants) disappeared. The middlegen view 
now only shows 2 tables!! This is what my ant task looks like:

<target
   name="mymiddlegen"
   description="Run Middlegen"
   unless="middlegen.skip"
   depends="init,fail-if-no-xdoclet-1.2,check-driver-present,panic-if-
driver-not-present"
>
  <mkdir dir="${build.gen-src.dir}"/>
  <echo message="Class path = ${basedir}"/>

  <taskdef
    name="middlegen"
    classname="middlegen.MiddlegenTask"
    classpathref="lib.class.path"
  />

  <middlegen
    appname="${name}"
    prefsdir="${src.dir}"
    gui="${gui}"
    databaseurl="${database.url}"
    initialContextFactory="${java.naming.factory.initial}"
    providerURL="${java.naming.provider.url}"
    datasourceJNDIName="${datasource.jndi.name}"
    driver="${database.driver}"
    username="${database.userid}"
    password="${database.password}"
    schema="${database.schema}"
    catalog="${database.catalog}"
  >

       <many2many>
            <tablea generate="true" name="MERCHANTS" /> 
            <jointable name="GROUPS_MERCHANTS" generate="false" /> 
            <tableb generate="true" name="GROUPS" /> 
         </many2many>

     <!-- Plugins -->
     <hibernate
        destination="${build.gen-src.dir}"
        package="${name}.hibernate"
        
javaTypeMapper="middlegen.plugins.hibernate.HibernateJavaTypeMapper"
     />

   </middlegen>
   <mkdir dir="${build.classes.dir}"/>
</target>

Any ideas?