Ant tasks packed with 8u40 stopped generating jfx:javafx-runtime element in jnlp file (tested with 8u60_b07 too), this worked in 8u20. Only j2se attribute from fx:platform is accepted now.

<target name="package-app">
<fx:deploy outdir="${dist.dir}" outfile="${project.application.outfile}">
<fx:platform javafx="8.0" j2se="1.8+" />
<fx:resources>
<fx:fileset dir="${dist.dir}" includes="*.jar" />
</fx:resources>
</fx:deploy>
</target>