# code

Bio4j is developed in Java and Scala, licensed under the AGPLv3 license. All development happens in GitHub, under the bio4j organization; in particular the bio4j/bio4j repository acts as an entry point for the whole codebase.

### Developers mailing list?

There’s bio4j/bio4j gitter room

We also use the issues from the bio4j/bio4j repository for general discussions, feedback, and communication between developers.

We don’t use mailing lists for development. In our opinion they make it really hard to link to code, get some real output from conversations or more prosaic things such as code syntax highlighting (that gitter supports beautifully).

### Contributing

With respect to contribution formalities we try to:

• keep things as simple as possible for everyone
• make sure that things stay open and available under any circumstances

Guided by that, for contributors we just require that

1. you agree to the standard text in the Developer Certificate of Origin 1.1
2. you sign your commits using git commit --signoff

The sign-off is a simple line at the end of the commit message for the patch or pull request, which certifies that you wrote it or otherwise have the right to pass it on as an open-source patch. The rules are pretty simple: if you can certify what is said in the Developer Certificate of Origin 1.1 (see also below) then you just add a line saying

When committing using the command line you can sign off using the --signoff or -s flag. This adds a Signed-off-by line by the committer at the end of the commit log message.