Server side scripting is a niche where Java finds its uses. But again it has some good competition in this market aswell.
Applets embedded in webpages are being taken over by other technologies such as Flash etc. which is quite advanced nowadays and is accepted as a standard.
Java for the desktop never really took off. It has always been something you can live quite happily without.
This is not to undermine the efforts of developers porting JVM to Amiga platforms. Their work should be appreciated. At this point in time Amigans need every possible feature to play catch up, however limited in use.