Although Ki has been in production use in applications for over 4 years under the previous name of 'JSecurity', we are new to the Apache Incubator and have not made an official Apache release yet. Therefore you will need to download the code from Subversion and build it using Maven:

1. Check out the code:

   mkdir ki
   cd ki
   svn co http://svn.apache.org/repos/asf/incubator/jsecurity/trunk/

2. Build the project using Maven:

   mvn install

3. Use the resulting all/target/apache-ki-all-<version>.jar file in your application.