I am a fan of the JVM.

One definite problem I see is that (i) the Oracle JVM works better than Open JDK if you are doing anything demanding, and (ii) the Oracle JVM installer wants manual confirmation that you accept the license when you install it. (There is an answer for (ii) but that is all I will say about it.)

I think Java might be a harder platform to pick up than some other platforms. I have been programming in Java since Java was in beta, but today you need to know about Maven, probably Spring and also you need to have an IDE that provides more solutions than problems.