After upgrading from Ant 1.6.5 to Ant 1.7 my build script displays strange
warning

-----------------
Warning: Reference classpath-xjc has not been set at runtime, but was
found during
build file parsing, attempting to resolve. Future versions of Ant may
support
referencing ids defined in non-executed targets.
-----------------

Could you please explain what it means exactly?

This warning gets displayed in this target

  <target name="xjc" depends="make-gen-src-dir" if="
unit.has.jaxb.sources">
    <taskdef name="xjc" classname="com.sun.tools.xjc.XJCTask"
classpathref="classpath-xjc"/>
    <xjc target="${unit.generated.src.dir}" extension="true" readonly
="yes" removeOldOutput="yes" catalog="${project.xmlcatalog.file}">
       <schema dir="${unit.jaxb.dir}" includes="*.xsd"/>
       <binding dir="${unit.jaxb.dir}" includes="*.xjb"/>
       <depends dir="${project.xmlcatalog.dir}"/>
       <produces dir="${unit.generated.src.dir}"/>
    </xjc>
  </target>


The reference "classpath-xjc" is defined as following in some other target

    <path id="classpath-xjc">
       <filelist dir="${global.p4root.dir}" files="
${global.lib.classpath.xjc}"/>
    </path>

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