How to Try
Trying z2@Spring works just the same for z2@base as described in Check it Out - the only difference is the repository to start with.
Simply execute the following steps:
For Subversion users:
- Make sure you have an Eclipse installation with a subversion plugin
- Check out http://www.z2-environment.net/svn/z2_spring/branches/v2.0/core as core into a new Eclipse workspace. Use user/password z2_spring/z2_spring
For Git users:
- Make sure you have Eclipse and EGit
- Clone from git://gitorious.org/z2_spring/core.git
General
- Create an “External Tool” in Eclipse pointing to core/run/bin/gui.sh (Linux, Mac) or core/run/bin/gui.bat (Windows). This simplifies starting the environment from within Eclipse.
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Run the tool. The z2 GUI console should startup:

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Once started point your browser to http://localhost:8080/frontend you should see this:

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Unless you have done so before, install the Eclipsoid plugin from the update site
http://www.z2-environment.net/eclipsoid/update/
While that is not strictly required it improves the development experience dramatically.
That's it. You have a running z2_spring system and you are all set for local testing and development.
Please revisit the Check it Out tutorial if you want to experiment with local changes.
See Installing_into_own_repository on how to pull your own distribution.