How to Call Java Functions/Classes From C#.Net

Question

5.00/5 (1 vote)

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Hello,

Good Afternoon.

I have an Application Containing Two methods
The application is Coded in Java.

How Can I call Java methods from VS C#.net.

can anyone Help me?

Thanks and Regards
Lakshman C B

Posted 4-Oct-11 23:23pm

Lakshmancb

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Comments

Pravin Patil, Mumbai 5-Oct-11 6:08am

What type of application is it that you mentioned is in JAVA..? i.e. is it API, Console application or what..?

Lakshmancb 5-Oct-11 7:14am

Hello Mr. Pravin,

Its a simple applcation in Java containing two methods.
Those Tow methods should be accessible from outside.

Thanks
Lakshman

5 solutions

Solution 1

From a quick Google (which you should have tried first), these guys[^] offer a paid-for solution, though I don't know how much it is.

There is no simple way, as the two VMs are completely incompatible. You need to write communication/marshalling code on both sides, or use a tool which writes it for you (for example web services).

If you are in control of the source code on both sides it may be best to rewrite the Java part in a .Net language, if .Net is your target final platform. That depends on how deeply integrated the code is with Java libraries etc that there is no direct equivalent for in the Framework.

Posted 5-Oct-11 0:32am

BobJanova

Comments

Sergey Alexandrovich Kryukov 5-Oct-11 16:03pm

Yes, I heard about this, my 5 for bringing this link.
However, there are three well-known free products here, two of them open-source; please see my solution.
--SA

Simon Bang Terkildsen 6-Oct-11 8:02am

+5

Solution 5

Write a Java webservice wrapper which will call these two methods and host the service.

Now call this webservices in your .NET application and you are done.

Posted 11-Oct-11 5:28am

bbirajdar

Solution 2

If you have Java source code, you should rewrite those methods in C#.

Posted 5-Oct-11 2:06am

Oshtri Deka

Updated 6-Oct-11 22:26pm

v2

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-10-05T10:00:00

Solution 3

You could do one thing: move Java code to .NET using some product implementing Java as language for .NET and Mono.

One such product is IKVM.NET, http://en.wikipedia.org/wiki/J_Sharp[^]. The product is free, under permissive zlib License, http://en.wikipedia.org/wiki/Zlib_License[^].

Another option like this is J#, but this project is not supported now, see http://en.wikipedia.org/wiki/J_Sharp[^], http://msdn.microsoft.com/en-us/vjsharp/default.aspx[^].

The last choice from this row is Ja.NET, see http://www.janetdev.org/[^], also Open Source.

I would look at IKVM.NET first.

—SA

Posted 5-Oct-11 10:00am

Sergey Alexandrovich Kryukov

Updated 5-Oct-11 10:56am

v2

Comments

Espen Harlinn 5-Oct-11 16:38pm

IKVM is pretty nice

Sergey Alexandrovich Kryukov 5-Oct-11 16:55pm

Thank you, Espen.
Did you use it?
--SA

Espen Harlinn 5-Oct-11 17:04pm

Yes, it's any easy way to move stuff from java to .Net.
About a year ago I wrote a JNI based Jave/.Net integration layer based on ideas from Jace. I thought about a name "Jni4Net" and discovered that Jni4Net already was used for a similar piece of technology - I took it for a spin, and threw out my own code :-/ - well these things are bound to happen from time to time :-D

Sergey Alexandrovich Kryukov 5-Oct-11 17:23pm

Great.
I understand this way is easy enough. :-)
--SA

Simon Bang Terkildsen 6-Oct-11 8:04am

My 5

Sergey Alexandrovich Kryukov 7-Oct-11 11:25am

Thank you, Simon.
--SA

Espen Harlinn · Accepted Answer · 2011-10-05T10:40:00

Solution 4

Have a look at Jni4Net[^] - it's free and works fairly well - actually it's pretty powerful :)

Best regards
Espen Harlinn

Posted 5-Oct-11 10:40am

Espen Harlinn

Comments

Simon Bang Terkildsen 6-Oct-11 8:04am

nice one, got my 5

Espen Harlinn 6-Oct-11 10:25am

Thank you, Simon!