是否有可能在 .NET 中使用 JAR 文件？

Question

Initial situation

First of all, I want explain the initial situation of my problem. I'm aware of the non-existing interoperability between Java and .NET. I've done a lot of research about this topic already, but couldn't find a suitable solution yet. Anyways I am convinced that there is a solution!

I'm creating a C# library that needs access to .jar files or more precisely it needs access to Java classes. The use of Java classes in C# is very important, since I need to pass in parameters and wait for a result.

Example

The following is a very simplified example of how it should ideally work. Note that deviations are welcome, since they can't be excluded in the final solution. The only important thing is that I can create a class instance of the Java class in C#.

calculation.java:

public class Calculation
{
    public int Add(Integer a, Integer b)
    {
        return a + b;
    }

    public int Subtract(Integer a, Integer b)
    {
        return a - b;
    }
}

entrypoint.cs:

// Implement / load the Java file
// like: using calculation;

public class Foo
{
    public string Bar()
    {
        // The original constructor of the class is of course in Java
        Calculation calc = new Calculation(); // Create class instance
        int res = calc.Add(5, 10); // Call method
    }
}

Progress

First of all I tried to integrate / load the .jar files into Visual Studio / C# directly, but I couldn't find a way to do something like that.

Futhermore I tried to use IKVM8 to convert my .jar files into .dll files ( D ynamic L ink L ibrary), but the open-source project isn't maintained anymore & I get weird errors along the way.

Another possible solution is to use JavaScript to create the class instances and to implement JavaScript into C#, but I think this is a very unclean way if it is possible at all.

Currently I am trying to convert the .jar files into .dll files again via Jni4net . However, I couldn't figure out how to use it in order to translate the .jar files into .dll files.

I highly appreciate any suggestions, sheers!

Answer 1

You should have a look at JNI (Java Native Interface), with it you can instantiate a Java VM from C# and instantiate and call Java classes.