THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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You'll find the release files in roller_trunk/web-assembly/target. You can use the Roller Installation Guide for instructions on how to deploy the release files to Tomcat and other Java app servers.
Other resources
Here's an excellent blog post from Harald Wellmann that explains how to setup Eclipse and m2eclipse plugin to build, test and run Roller: http://hwellmann.blogspot.com/2010/02/setting-up-eclipse-for-roller.html