Hi,
when trying to use a freshly created seam project (seam-gen) in Eclipse Europa (3.3) I got an error message stating that the ant "BUILD FAILD" (Mac OS X).
After some investigation I found out that the .exploded build target (Project Properties->Builers) was set to run in the same JVM as the workspace. This seems to have some influence of the environment for the ant script.
After setting the JVM to a separate JVM all worked fine.
Alex