Call any Java method from C#

Is there a way using JNI and C# code to create a program that invoke any given Java method? Assume that I have a jar containing classes hierarchy and I'm responsible for loading the JVM and these classes, can I write a C# program that receives the java method signature + arg开发者_如何学运维uments values on the fly and call the java code?

Please try to restrict your answers to free technologies (JNI solutions prefered).

IKVM is one option. It implements a JVM in .Net and provides interop tools.

IMHO the best way would be to run the Java Program as a WebService (or create a Java based WebService Interface for it) and just call it from C#.