/usr/share/gcj/debian_defaults is in libgcj-common 1:4.6.3-1ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # architectures with gcj support
gcj_archs = alpha amd64 armel armhf hppa i386 ia64 lpia m68k mips mipsel powerpc powerpcspe ppc64 s390 s390x sh4 sparc sparc64 kfreebsd-amd64 kfreebsd-i386 hurd-i386
# architectures which should provide gcj native support
gcj_native_archs = alpha amd64 armel armhf hppa i386 ia64 lpia mips mipsel powerpc powerpcspe ppc64 s390 s390x sh4 sparc sparc64 kfreebsd-amd64 kfreebsd-i386 hurd-i386
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