I found some possible bugs in gij (GNU libgcj) version 5.4.0, but I did not know where can I report them to the developer?
My OS: Ubuntu 16.04.6 LTS
gij version:
$ gij -version
java version "1.5.0"
gij (GNU libgcj) version 5.4.0 20160609
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.