<taskdef resource="org/apache/commons/attributes/anttasks.properties"> <classpath refid="attribute-compiler-classpath"/> </taskdef> <!-- Compile to a temp directory: Commons Attributes will place Java Source here. --> <attribute-compiler destdir="${commons.attributes.tempdir.src}"> <!-- Only the PathMap attribute in the org.springframework.web.servlet.handler.metadata package currently needs to be shipped with an attribute, to support indexing. --> <fileset dir="${src.dir}" includes="*/metadata/.java"/> </attribute-compiler> The following code has red <attribute-compiler> usages even, if the task is properly configured using <taskdef> and its resource attribute which points to the property file with multiple task definitions.