Using .Net library through COM or direct integration in Java

Question

I have to admit that the last time I programmed in Java was a data structure class in high school. So please be kind to this Java noob.

I spent a lot of time building the C # COM library at work. This library relies heavily on some new .Net technologies (WPF is big), so translating into another language is actually not an option. I tested this library from C ++ through the COM interface, and it was quite simple. I would also like to prove that the same library can be used from a Java program.

So, the problem I am facing is that I cannot find a free or even inexpensive way to use COM objects from Java. I think another solution would be to find a way to directly integrate the library. Does anyone have any input on what might be the best way to do this? I am using Eclipse for my java environment. Below is an example of what my C # code looks like. Thanks for any direction you can provide.

//Example C# Object Code [Serializable, ComVisibleAttribute(true), Guid("Long Guid String"), ClassInterface(ClassInterfaceType.None), ComSourceInterfaces(typeof(IFooBarStructure)), ProgID("My Application")] public class MyFooBarObject { public MyFooBarObject(){} public string DotNetMethod(){ return String.Empty; } } 

Answer 1

You can use jacob

From the website:

JACOB is a JAVA-COM bridge that allows you to invoke COM Automation components from Java. It uses JNI to create its own calls in the COM and Win32 libraries.

Sounds like you're looking.

Answer 2

If you have some money to spend on a commercial product, I recommend that you take a look at Intrinsyc J-Integra for COM or J-Integra for .NET . I used my COM product to access a third-party ActiveX control (Bloomberg data access library) from Java code for a project that I worked on several years ago, and it worked very well. They have a reasonable trial / demo policy, and they are quite responsive to support requests.

Answer 3

If you can access your library through C ++, you can access it through JNI. JNI is pretty easy to do, just read the manual , especially in section 8.6, which talks about the differences between C and C ++

Answer 4

Direct integration with Java / .NET can be done using OOJNI. Google "Object Oriented JNI for .NET."

Answer 5

I am the author of jni4net , an open source interprocess bridge between the JVM and the CLR. It is built on top of JNI and PInvoke. No C / C ++ code required. Hope this helps you.