I suspect .net -> Java is a lot, lot harder than the reverse, simply because the CLR is more modern than the Java VM (e.g., introspection, attributes, security model, etc.), but it’s surely possible.

Personally; I’m not sure I’d see the point: writing a C# compiler for Java would be extremely worthwhile and would give you 90% of the benefits anyway (again, modulo complexity of C# over Java).

Hey Jo, Do you have some documentation to create a reverse implementation ( a java implementation of .net?)

Well, start off with ECMA 335, especially the bytecode section. Then look at the Java specifications (such as they are).

Chances are, you would need to provide .class versions of the .NET CLR, the way IKVM.NET provides CLI assemblies containing OpenJDK. Translating the actual calls (e.g. turning System.Console.WriteLine to system.out.println) is a -MUCH- harder problem.

Help me.

.NET want to live alone ..Net does not like competitors.

“Welcome to Ja.NET — a new web site building an open community dedicated to enabling Java as a first class development and runtime environment for .NET. Our vision is simple: Establish a community of interest, together with a set of projects, focused on delivering the tools and middleware required to leverage the enormous investments that exist today in Java software on the .NET platform.“

And IKVM.NET does the same thing, and runs fine on Mono. Personally I thought Ja.NET was an academic ISP in the UK

Look:http://www.janetdev.org/

Only works in .net framework 3.5.Does not work in mono.

We need to do a reverse implementation . (a java implementation of .net)