d:\apps\jdk118\lib\tools.jar;.\lib\xerces.jar;.\lib\ant.jar;d:\apps\jdk118\c > lasses.zip;d:\Java\1.1collections\lib\collections.jar > Starting Ant... That classpath doesn't make sense since the build scripts would place classes.zip *after* collections.jar. Are you using the latest version? Have you modified the scripts? -jh-