Yeah, this used to be done by way of the JDTCompilerAdapter, used by the compiler attribute of the Ant javac task. With Java1.5 that adapter barfs on the annotations. I've read that you need to pass compiler params to javac, but apparently that can't be done with Ant 1.6.x. Oh, I got it. It was the Seam Getting Started Guide that requires Ant 1.6. http://labs.jboss.com/portal/jbossseam/gettingstarted View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4016704#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...