I have a project written in Java (>1.5).
Is it possible to write parts of the project with C#?
For instance the GUI and calling the methods and instantiate the classes written in java?
If yes, how?
Asked
Active
Viewed 2.7k times
6 Answers
19
I am author of jni4net, open source intraprocess bridge between JVM and CLR. It's build on top of JNI and PInvoke. No C/C++ code needed. I hope it will help you.
Pavel Savara
- 3,427
- 1
- 30
- 35
8
Not without something like ikvm - or using web services etc to communicate between the two sides. Basically it's likely to be much more work than either rewriting your existing project code in C# or writing the GUI in Java.
Jon Skeet
- 1,421,763
- 867
- 9,128
- 9,194
-
Can you explain why it's not possible with dll approach ? Rewriting is an option for small project rewriting 100.000 line for example might be costly ... – Ilya Oct 05 '08 at 12:56
-
You'd need to be running both the CLR and the JVM - and the two VMs don't know about each other's objects. – Jon Skeet Oct 05 '08 at 14:08
-
You mean, Ilya's answer is not working? – Burkhard Oct 05 '08 at 17:09
-
Ilya's answer only applies if you're using the Excelsior JET JRE, and only up to v3.7. – Jon Skeet Oct 06 '08 at 09:42
-
I edited my answer to avoid confusion. – Ilya Oct 15 '08 at 07:44
6
There is something called Java Language Conversion Assistant for .NET. You can convert your Java classes to c# and start coding.
There is also something called JNBridge (not free).
C. K. Young
- 219,335
- 46
- 382
- 435
Midhat
- 17,454
- 22
- 87
- 114
-
Or if you don't mind the heavy class library, use IKVM.NET. https://github.com/jessielesbian/ikvm/ – Jessie Lesbian Nov 25 '19 at 02:52
4
It seems like my solution is very limited. and apply only to specific version of java.
I probably will stay with old good C :) Can't imagine how to work without shared libraries :)
This document explain how to create a dll from java and use it in C code. I'm not C# or java expert but i'm sure that you can load external dll's in C# as well. So not a complete solution but good starting point, IMHO. Generally dll it's a perfect way to mixing languages.
Ilya
- 3,104
- 3
- 23
- 30
-
Note that that document only applies to a particular JRE, and only up to a particular (fairly old - 2005) version. – Jon Skeet Oct 06 '08 at 09:43
-
Like i mention i'm not a java expert. Does it mean that that creating dll in java is not trivial ? How one share libraries in java ? – Ilya Oct 15 '08 at 07:38
-
Ilya: Java libraries are shared in JAR-files. They are essentially compressed archives (zip I believe) that contain the Java bytecode compiled files and other resources. – Spoike Oct 15 '08 at 07:48
2
In simple way you can pack your java classes to jar file then In C# use Process class for execute and map IO stream
Fuangwith S.
- 5,654
- 8
- 37
- 41
0
I did some research on this a few years ago (2005 I believe) and I liked JNBridgePro as the best third party product to do this. Check it out here http://www.jnbridge.com/
Good luck!