Java Password Strength Check

How do you insure your users passwords meet required standards?
For a front end HTML solution to strong password checking see Steve's Javascript example.
On the Java server side or from the command line take a look at PasswordCheck. This code extends Steve's script onto the server side allowing pre-defined rules to determine pass or fail strength checking before the user's password is stored to the database, LDAP or other directory server. Open source licensed.