You can add support classes to all the generated jar fils by including a
<support-classes> nested element. This is effectively a fileset and
includes the ability to reference another fileset by refid

So
<ejbjar ...>
       <support-classes dir="${build.classes.server}">
            <include name="**/*.class"/>
       </support-classes>
...
</ejbjar>

or

<ejbjar ...>
       <support-classes refid="support.fileset"/>
...
</ejbjar>


Please note the following.
==========================
If your ejbjar task generates multiple jar files, the support classes will be
added to each one.

The nested element name may change. I am using it to test a facility I added
to the core. If it does change, it will change to <support>


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268486 13f79535-47bb-0310-9956-ffa450edef68