It is good practice to verify the integrity of the distribution files.
You are currently using http://psg.mtu.edu/pub/apache/. If you encounter a problem with this mirror, then please select another. If all mirrors are failing, there are backup mirrors at the end of the list. See status of mirrors.
This is the basic download for all users of JDO.
This is a download for all implementors of JDO, and for those who want to check how well an implementation is compliant with the JDO specification.
This is only required by implementors of JDO.
It is essential that you verify the integrity of the downloaded files using the PGP signature and/or the MD5 checksum. The checksum is not as strong an indicator as the PGP signature is.
The PGP signatures can be verified using PGP or GPG. First download the KEYS as well as the asc signature file for the particular distribution. Make sure you get these files from the main distribution directory, rather than from a mirror. Then verify the signatures using
% pgpk -a KEYS
% pgpv release_name.tar.gz.asc
% pgp -ka KEYS
% pgp release_name.tar.gz.asc
% gpg --import KEYS
% gpg --verify release_name.tar.gz.asc
Alternatively, you can verify the checksums on the files. Unix programs called md5/sha1 or md5sum/sha1sum are included in many unix distributions. *sum is also available as part of GNU Textutils. Windows users can get binary md5 programs from http://www.fourmilab.ch/md5 and hhttp://www.pc-tools.net/win32/freeware/console. Windows SlavaSoft fsum supports MD5 and SHA1.
We highly recommend verifying the PGP signature, though.