java/util/generate-sources-build.xml

<project name="generate-sources">
    <echo message="Running protoc ..."/>
    <mkdir dir="${generated.sources.dir}"/>
    <exec executable="${protoc}">
        <arg value="--java_out=${generated.sources.dir}"/>
        <arg value="--proto_path=${protobuf.source.dir}"/>
        <arg value="${protobuf.source.dir}/google/protobuf/json_options.proto"/>
        <arg value="${protobuf.source.dir}/google/protobuf/json_enumvalue_options.proto"/>
    </exec>
</project>