Subversion Plugin: Repository URLs with no realtive repository path not working

When I configure repositories in subversion-jira-plugin.properties I used to specify the repositories linke:

svn.root=http://uptoip-repos.ams.stiwa.com/
svn.root.1=http://buildingci-repos.ams.stiwa.com/

This is not working anymore! I get an error:

2006-05-08 21:28:30,580 ERROR [plugin.ext.subversion.SubversionManagerImpl] Connection to Subversion repository http://uptoip-repos.ams.stiwa.com failed: org.tmatesoft.svn.core.SVNException: svn: No part of path '' was found in repository HEAD

To resolve this I have to specify the rpositories with a relative path:

svn.root=http://uptoip-repos.ams.stiwa.com/trunk
svn.root.1=http://buildingci-repos.ams.stiwa.com/trunk

But this is unsatifactory since changes (commits) in branches /branches) are not indexed and shown in JIRA.