Hi, I am working on fixing Travis CI, I have now found the "problem", and it seems a real problem about LICENSE file.
On MaxOS and on Linux builds Travis used to use Maven 3.3.9. Now Travis ships Maven 3.6.2 on Linux and the license checker started to break because with 3.6.2 we are bundling now 3 more jars: Http components and Lib Thrift and our LICENSE file do not take those libraries into account. The fix fixes the LICENSE file and forces latest (3.6.3) Maven on MacOSx We are already building releasing BookKeeper binaries with Maven 3.6+ so the issue on LICENSE file should be real and it affects 4.10.0 binaries and maybe older releases. please any committer check this patch, we are holding every other pull request with Travis failures https://github.com/apache/bookkeeper/pull/2228 Best Regards Enrico