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Branch should be deleted on branch merged to master or issue cancelled. Committers are in charge of deleting their branches.  

Checklist before pust

List of points should be checked before pust: 

Javadoc

Make sure project build log contains no javadoc warnings.

Readme

In case new module added, make sure module contains README.txt at module's root.

Licenses

In case new module added, make sure source and binary distributions contains correct license files at modules folders.