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You can download (aka checkout) the sources of Apache OpenEJB with Subversion client using the following URL http://svn.apache.org/repos/asf/openejb/trunk/openejb3openejb.
Performing the checkout from the command line using the subversion client is as easy as executing the following command:
$ svn co http://svn.apache.org/repos/asf/openejb/trunk/openejb3openejb
If you are experiencing problems with errors like "400 Bad Request (http://svn.apache.org)", try using:
$ svn co https://svn.apache.org/repos/asf/openejb/trunk/openejb3openejb
or alternatively with Apache Maven 2 or later:
mvn scm:checkout -DconnectionUrl=scm:svn:http://svn.apache.org/repos/asf/openejb/trunk/openejb3openejb -DcheckoutDirectory=openejb3openejb
It's not yet known how to see the progress of the checkout as mvn scm:checkout checks out the sources non-interactively. It's worth to know about the command, though, as it doesn't require the subversion client.
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