Add copyright information

[robertschubert]

Request:
Please add a copyright information into the header of each java file as requested by the apache license (in the appendix, see below).
I would very much appreciate if you could add this text with the copyright to the pom.xml(s) also.

Background:
In the appendix of the apache 2.0 license it is described how the apache 2.0 license should be applied (see https://www.apache.org/licenses/LICENSE-2.0):

There is the "Copyright .... on the top of the comment.
All .java-Files except 3 Testclasses are missing the copyright notice.

I already forked the repository but I am not sure what copyright notice you want to insert. Thats the reason why I raised this issue.

Why I am asking:
We are running the tool "scancode" on the extracted jar file. This tool extraces license and copyright information. And this is the reason why I would very much appreciate to have the copyright notice also in (all) the pom.xml(s).

[nitsanw]

IIRC there's a maven plugin that can assist here. Can you find a good way to automate the process and check?