ok just tried a service install using 0.2.9a.tar.gz (the one on the website).  It work both for a 1.6_u25 Sun JDK.  I tested both the 32bit and 64bit versions ok.  I haven't tried openJDK1.7 but I can't see any reason why it would fail.  Unless "C:\Program Files\Java\jdk1.7.0\jre\bin\server\jvm.dll" doesn't happen to exist in openJDK?

You might try editing win-service.bat and changing the options : --StartMode=jvm and --StopMode=jvm to either 'java' or 'exe' (no quotes).

Detail doc on service options available here: http://commons.apache.org/daemon/procrun.html

procrun can be a bitch to get right so I'm scared to touch it once I've found a working config.