The sourcecode for Suns JDK/JRE are available from their website (free registration required). It of course needs a lot of work to compile on a new platform such as MorphOS. The thing is, someone could invest money in a project to have it ported. The FreeBSD-people ported it themselves and has now gotten it officially approved by Sun as it has been successfully tested with their test-suite (which means that it should fully support all Java 1.4.1 features). This was done mostly with GCC 2.95 so it should be doable on MorphOS as well.