Subversion integration is supported out of the box for Subversion 1.6 to 1.9.x.
Auto-detection of SVN during analysis will happen if there is a .svn folder somewhere in the parent hierarchy of the project root. Otherwise you can force the provider using -Dsonar.scm.provider=svn on the analysis command line.
If you get errors like:
Caused by: org.tmatesoft.svn.core.SVNException: svn: E200007: Retrieval of mergeinfo unsupported by 'https://pmd.svn.sourceforge.net/svnroot/pmd/trunk/pmd/src/main/java/net/sourceforge/pmd/AbstractConfiguration.java';
It means that the SVN server is not advertising the 'mergeinfo' capability. You can check the advertised capabilities by simply connecting to it:
telnet <svn_server> 3690
Often this is because your SVN server is not >= 1.5 or your project was not properly migrated after a server upgrade. It could also be a misconfiguration of the server.
You should try to run svnadmin upgrade on the server. For more information, please read https://subversion.apache.org/docs/release-notes/1.5.html#repos-upgrades.