[Subclipse-users] Cannot use javahl nor command line svn client

We are using svnant inside of CruiseControl 2.5.
Since we switched over from Java 1.4 to 1.5, the svnant task is still
working well when we do
"ant -f myproject.xml"
also it is working well when CruiseControl is started in batch mode
(main\bin\cruisecontrol.bat)
but we get the following error message
"Cannot use javahl nor command line svn client"
when CruiseControl is running as a service.
The service actually is running in the same account that we also used
for manual runs, so it is not a problem of access rights.

Can the svnant team please give us some hints what to check for?
The svn command line client actually IS accessible.
So what can be the reason that it is not found from the service but it
is running from batch mode?

Thanks for every tip!
Markus