XZ for Java 1.2 is available at <http://tukaani.org/xz/java.html> and in the Maven Central (groupId = org.tukaani, artifactId = xz). Here is an extract from the NEWS file:
* Use fields instead of reallocating frequently-needed temporary objects in the LZMA encoder. * Fix the contents of xz-${version}-sources.jar. * Add OSGi attributes to xz.jar. -- Lasse Collin | IRC: Larhzu @ IRCnet & Freenode