I have a project in Eclipse with many classes.
My condolences on using a build system that apparently has grabbed you by the short & curlies. That can be painful.
1) Eclipse can use Ant style build.xml files for controlling most aspects of a build (that are worth mentioning).
2) We provide no support for Eclipse on these groups, but since Ant typically defers to a core set of tools in the SDK, you can usually get away with asking an Ant related question.