Using External Jar Files In Your Custom Ant Task Classpath.
It took me a while to figure out that I could specify several items in the classpath
attribute of the
taskdef
tag in my build.xml file.
Here is one example:
<taskdef name="CreatePartition" classname="org.wwre.ant.tasks.xis.CreatePartition" classpath="build/classes;${xis.client.jar};${log4j.jar}" />