in this case Ant codegen will not work correctly... no exceptions... JBIDE-6703 - was initial issue to find this,
to check it -> for Query exporter -> Ant code generation should generate this:
<query destdir="/hibtest2/ant" destfile="queryOutRes.txt">
<hql>from org.gen.Customers</hql>
<property key="ejb3" value="false"/>
<property key="jdk5" value="false"/>
</query>

not this:
<query>
<property key="ejb3" value="false"/>
<property key="jdk5" value="false"/>
<property key="outputFileName" value="queryOutRes.txt"/>
<property key="outputdir" value="/hibtest2/ant"/>
<property key="query_string" value="from org.gen.Customers"/>
</query>