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1. download Maven 3.0 from http://maven.apache.org/download.html. Please note and make sure you do get & use Maven 3.0 (latest at the time of writing this Maven 3.0-alpha-6), and not just a Maven 2.2.1, which will NOT WORK.
2. check-out the https://svn.apache.org/repos/asf/openjpa/devtools/trunk/ (not just the individual project directories, but really the trunk, so that you also have the pom.xml at the root...)
3. do a "mvn install" at the root. This will be VERY SLOW at first invocation, as it downloads lot's into
   your local maven repo, including many Eclipse artefacts. Subsequent calls will as usual be much faster.
4. in the directory "org.apache.openjpa.eclipse.site/target/site" there will be a completely ready Eclipse Update Site (which is what gets be pushed to some HTTP server and the URL of which is given to end-users to install the whole thing)

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