dev-java/kxml-1.2.1 in java-overlay has LICENSE="Enhydra", but that license does not exist. A license file must be added to java-overlay/licenses/ or the LICENSE setting changed in java-overlay/dev-java/kxml/kxml-1.2.1.ebuild (or both).
kxml2 has been moved to the main tree a while ago. The licence used for this software is a BSD one. Excerpted from http://kxml.org/index.html: "kXML2 is the current version of kXML. In contrast to kXML1, it features cursor API instead of event objects, leading to a reduced footprint and less object creation overhead. kXML 2 is released under the BSD license."