Fully Multiplatform Pure Java Development for Desktop, Web, Android and iOS

Almost all Java developers know that it is possible to write code in Kotlin that will run on the JVM, in the browser and on the iPhone. But is it possible to write such a multiplatform solution in pure Java? And it would be comfortable, fast and everything would be nice... The story about the technology and experience of running Java programs on a wide range of devices and systems: Web, Desktop, iOS, Android using AOT-compilers GraalVM and TeaVM.