Calling jar file from asp.net

[moshi cochem]

Hi,
Somebody has any experience in it ?
Thanks for any clue...

[Ulf Dittmer]

What do you mean by "calling"? Executing a method? Running an executable jar file? Something else?

[moshi cochem]

Yes, calling a method that located inside the jar file.
I want a Aspx file - c# to call a method in the jar.
Tnks

[Paul Sturrock]

Not possible I'm afraid. You can call Java programs from C#, but not individual methods.

[Rob Spoor]

Well you can using JNI, in the same way you could call Java methods from C or C++*. After all C# can call native methods too.

You would probably need to create a DLL with a function that when called creates a temporary JVM, creates the necessary objects, calls the method and cleans all up again. This DLL is then loaded by the C# code and the function called from it. How you would load the DLL and call the function is beyond the scope of JavaRanch though; you would have more success on Microsoft's MSDN forums.


* JNI allows you to create a temporary JVM in native code with which you can do basically anything you can do in regular JNI - create objects, call methods, the works.

[Rob Spoor]

Anyway, all things considering, isn't it easier to take the Java method's source code and port that to C#? The two languages are very similar so it shouldn't be too hard.

[moshi cochem]

And what do you think about this: http://codebetter.com/blogs/jeffrey.palermo/archive/2005/04/07/128607.aspx ?

[Ulf Dittmer]

And what do you think about this: http://codebetter.com/blogs/jeffrey.palermo/archive/2005/04/07/128607.aspx ?

Well, does it work in your situation? Note that the class shown there does not depend on any of the classes in the Java class library or 3rd party libraries (which would not be available under .Net). If a class has no external dependencies, then it would probably be faster (and architecturally advantageous) to port it to C# rather than to go to all that trouble.