The latest version of svnkit (pure Java lib) is compatible with Subversion 1.7.
http://svnkit.com/download.php
You can download the standalone version and copy the libs from folder lib to your classpath. You need at least the last 5 jars.
<path id="path.svnant">
<pathelement location="svnant/svnant.jar" />
<pathelement location="svnant/svnClientAdapter.jar" />
<pathelement location="svnant/ganymed.jar" />
<pathelement location="svnant/svnkit-1.7.8.jar" />
<pathelement location="svnant/svnkit-javahl16-1.7.8.jar" />
<pathelement location="svnant/sqljet-1.1.6.jar" />
<pathelement location="svnant/antlr-runtime-3.4.jar" />
<pathelement location="svnant/sequence-library-1.0.2.jar" />
</path>