http://feather.cocolog-nifty.com/weblog/2010/06/netbeans69groov.html
<project xmlns:j2seproject3="http://www.netbeans.org/ns/j2se-project/3" xmlns:j2seproject1="http://www.netbeans.org/ns/j2se-project/1" xmlns:jaxrpc="http://www.netbeans.org/ns/j2se-project/jax-rpc">\r
<target name="-groovy-init-macrodef-javac">\r
<macrodef name="javac" uri="http://www.netbeans.org/ns/j2se-project/3">\r
+ <attribute default="${javac.processorpath}" name="processorpath"/> \r
+ <attribute default="${build.generated.sources.dir}/ap-source-output" name="apgeneratedsrcdir"/>\r
<attribute name="srcdir" default="${src.dir}"/>\r
<attribute name="destdir" default="${build.classes.dir}"/>\r
<attribute name="classpath" default="${javac.classpath}"/>\r