All java source files must contain the standard JNode header found in <jnode>/all/template/header.txt.
Do not add extra information to the header, since this header is updated automatically, at which time these extra pieces of information are lots.
Add any extra information about the class to the classes javadoc comment. If you make significant contribution to a class, feel free to add yourself as an @author. However, adding a personal copyright notice is "bad form", and unnecessary from the standpoint of copyright law. (If you are not comfortable with this, please don't contribute code to the project.)
All Java source files and other text-based files in the JNode project must be US-ASCII encoded. This means that extended characters in Java code must be encoded in the '\uxxxx' form. Lines should end with an ASCII linefeed (LF) character, not CR LF or LF CR, and hard tab (HT) characters should not be used.
If there is a pressing need to break these rules in some configuration or regression data file, we can make an exception. However, it is advisable to highlight the use of "nasty" characters (e.g. as comments in the file) so that someone doesn't accidentally "fix" them.