Abuild's Java rules can be customized using a layered approach. At the most basic level, you can set specific parameters that tell abuild how to run its normal rules. As you need more advanced functionality, you can override the locations that abuild uses for various types of files, pass additional arguments to various underlying ant tasks, cause targets to be run multiple times, or even supply your own Groovy closures to be run for specific tasks. This is also described in abuild's built-in help for the Java rules. The help text is included in this document as well; see Section E.8, “abuild --help rules rule:java”.