I can't enter Japanese texts in a Java GUI created with Swing, Javafx, etc.

I try to input Japanese texts in a textbox of a Java GUI by clicking the hankaku/zenkaku key which exists on the top-left corner of the Japanese keyboard.
But I can't input Japanse texts, instead English alphabets are input.

By the way,
$ env | grep -E '_IM|XMOD'
CLUTTER_IM_MODULE=xim
QT_IM_MODULE=ibus
XMODIFIERS=@im=ibus
QT4_IM_MODULE=fcitx
GTK_IM_MODULE=fcitx

But env must be the following?
$ env | grep -E '_IM|XMOD'
CLUTTER_IM_MODULE=xim
QT_IM_MODULE=fcitx
XMODIFIERS=@im=fcitx
QT4_IM_MODULE=fcitx
GTK_IM_MODULE=fcitx

Concerning the Ubuntu Gnome desktop environment, this bug is reported as follows:
https://bugs.launchpad.net/bugs/1594681
And in order to remove the bug, gnome-session and gnome-settings-daemon is updated shortly.

Ubuntu Unity seems to have the same bug as Ubuntu Gnome.
So I want that a bug-removing version of Ubuntu Unity is also released shortly.