Hi,
You need to build it from the source. How to obtain the source is
available here [1]. Ideally the nightly builds should be downloadable from
the website itself -- but not sure why it does not right now.

From the source, however, OpenJPA can be easily built with maven
build/release management system.
Get Maven (preferably version 2.0.8) and then from the root directory of
OpenJPA, run

$ mvn install

then Maven will download all build-time dependencies, place them in your
local machine and build the target OpenJPA jars.

Sometimes, maven fails to download the dependencies when run for the first
time. Just run it once more. Once the jars are built, you can run

$ java -jar your/path/to/openjpa.jar

which will print the version information and other details of the jar to
verify you have got the latest changes.

[1] http://openjpa.apache.org/source-code.html


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