jcommon: a set of libraries used inside Facebook java projects, internal and open source. This is the source, and the latest maven artifact can be found at maven central: jcommon source code. You can also find this on maven central. http://search.maven.org/#search%7Cga%7C1%7Ccom.facebook.jcommon jcommon-all is a 'bomb' that includes the whole thing. You may also depend on individual pieces such as 'stats' or 'concurrency' if desired (but this isn't recommended, as you may run into transitive version issues if you depend on an old stats and new config module (making this example up) license is Apache2 See : http://www.apache.org/licenses/LICENSE-2.0.html The short form is in License.txt. At present, this is *not* present in each file. We plan to do so. In the case you need to redistribute any subset of jcommon, please include the License.txt and add the contents to the files. Thanks! Committers: sr@fb.com hgschmie@fb.com ehwang@fb.com lif@fb.com timw@fb.com martint@fb.com dain@fb.com andrewcox@fb.com Other Contributors: ajaiswal@fb.com alessandro@fb.com groys@fb.com jasonj@fb.com junli@fb.com wwang@fb.com