Unable to input Japanese using fcitx5 (fcitx5-mozc) in Ubuntu in IntelliJ IDE

Question

Using fcitx5 (fcitx5-mozc) to input Japanese in IntelliJ IDEs in Ubuntu 24.04 is unavailable, but fcitx5 (fcitx5-mozc) can be used to input Japanese in other applications in Ubuntu 24.04.

Cause

Wayland is not enabled while using fcitx5 (fcitx5-mozc).

Solution

Please refer to https://fcitx-im.org/wiki/Using_Fcitx_5_on_Wayland on how to use fcitx5 with Wayland enabled.