Java the language is still very important, it is the systems programming language of the JVM.
On my .NET projects we get a full installation from Visual Studio on the development machines. Which means C#, F#, C++ and VB.NET available.
On my Java projects those machines have usually Eclipse + JDK. JARs are either vendored or make use of an internal Maven server.
I am yet to be allowed to use anything other than Java (the language) on those kind of projects.
Most customers want replaceable consultants so they don't allow us to go outside of their standard stack.