Janett provides a domain-specific language for mapping Java libraries to .Net. We call these files ''mapping''.

[MappingFile Mapping files] should be placed in Bin\Mappings\<Mode> directory. Their names should be !JavaType-!DotNetType.map and they can be grouped based on package:
{{{
java.lang.StringBuffer-System.Text.StringBuilder.map
java.io.BufferedReader-System.IO.TextReader.map
}}}
or
{{{
java.lang
   StringBuffer-System.Text.StringBuilder.map
java.io
   BufferedReader-System.IO.TextReader.map
}}}

within mapping files, you can map members of !JavaType to !DotNetType or [MappingFile ...]