The US military still does some minimal amount of bayonet training, so it wouldn't be surprising if the JDF and everybody else does also, though no army in the world intends to have it's troops fighting with a blade outside of some special situations like trying to take out a sentry quietly. The US military used to use it more to teach aggresiveness and decisiveness in a confrontational situation rather than because they thought most troops would ever use their bayonet in combat, now the US uses the Gracie Jiu Jitsu-based combatives training for that purpose, but other countries may still use bayonet training. The value of the bayonet in modern combat is probably indicated by the fact the the Soviet/Russion issue bayonet for the AK-47 is more a wire cutter than a bayonet, they just make it look like a weapon so the soldiers won't throw it away to avoid carrying it.