http://fedoraproject.org/wiki/Packaging/Java
All JAR files MUST go into %{_javadir}. Exceptions include JNI-using JAR files , and application-specific JAR files (ie. JAR files that can only reasonably be used as part of an application and therefore constitute application-private data).
Java API documentation uses a system known as javadoc. All javadocs MUST be installed into %{_javadocdir}.