How do you add a new variable to be inserted into a Java code template. How do I add a variable to the list in Window->Preferences->Java->Code Style->Code Templates->Code->N
I'm pretty sure that the list of "variables" is generated by Eclipse and there is no way to add a new template variable.
What do you want ${begin_filecomment} and ${end_filecomment} to be? Just type the content into the Edit box - there is nothing that says you cannot put static content in there.