I use eclipse. Never had problems with it. As for building, I figured out how to use maven to download dependencies to a separate folder and then I use eclipse

I use eclipse. Never had problems with it. As for building, I figured out how to use maven to download dependencies to a separate folder and then I use eclipse features to add jars to the project. (Eclipse has maven plugin, but I couldn't get it to work. Something or else made trouble, so I gave up.) Quite pleasant setup. > Realising that there's no standard equivalent of tasks and async There is: Executor and CompletableFuture.