Hi, I've just downloaded the file you've mentioned from this mirror:
http://ftp-stud.hs-esslingen.de/pub/Mirrors/ftp.apache.org/dist/tomee/tomee-1.7.1/apache-tomee-1.7.1-webprofile.tar.gz Unpacking the archive succeeded without any problem. So either you've chosen a non-working mirror (would be nice to know which one you've used) or something happend with your connection. The archive has exactly the size of 30656166 bytes. Apart from that it makes no sense to check the signature if a file could not be downloaded correctly. I suspect that you did something like 'wget'/'curl' for the links that are provided on the download page. These links are just pointing to a selection of mirrors so if you did so you need to download the files from there (f.e. http://mirror.netcologne.de/apache.org/tomee/tomee-1.7.1/apache-tomee-1.7.1-plume.tar.gz). Best regards Daniel Kasmeroglu
