http://maven.apache.org/guides/mini/guide-ibiblio-upload.html describes the process for uploading new releases for posting to the ibiblio master repository. The initial commit on this bug will commit a pom.xml that describes the 1.2.14 release (but is not sufficient to build it) and adds a "dist-maven" target to the ant build to produce from the 1.2.14 release tarball a jar archive that contains the pom.xml, log4j-1.2.14.jar and source and javadoc jars. After the 1.2.14 bundle is accepted, build.xml will be modified so that future 1.2.x releases will build the maven bundle simulatenously.
Changes committed in rev 480304 which is tagged as v1_2_14_maven. The URL mentioned in the original message only applies to non-ASF projects. The proper instructions for ASF projects appear at http://www.apache.org/dev/release-publishing.html#maven-repo. The changes to build.xml add two new targets "prep-maven" and "publish-maven". "prep-maven" unzips a distribution and creates a local repo directory (build/maven/repo) with the artifacts in the right place and generates the checksums and signatures. "publish-maven" uploads the contents of that directory to the ibiblio sync directory on people.apache.org.