Calling a JAVA DLL from Fortran

[ye_T_1]

I am trying to call a JAVA DLL from Fortran but I cannot find any tutorial on this issue. I wonder anyone has any experience？ Thanks

[SergeyKostrov]

>>...I am trying to call a JAVA DLL from Fortran but I cannot find any tutorial on this issue. I wonder anyone has any experience... I'm not 100% sure that it is possible to call Java Dll directly from Fortran application, like: 1. FortranApp -> JavaDll But, if you create an additional layer as C/C++ Dll it is possible, like: 2. FortranApp -> CCppDll -> JavaDll Or, if you create an additional layer as Java-based COM interface it is possible as well, like: 3.1 FortranApp -> JavaCOMDll -> JavaDll or 3.2 FortranApp -> JavaCOMDll I can look at my CD archives if you need some generic codes for solution 2, that is CCppDll -> JavaDll, and confirm if you really need it.

[Bernard]

Hi,

Do you mean to call java methods class wrapped into some dll file or are you refering to some part of JVM installation implemented on windows as a dll file?

[ye_T_1]

Hi Sergey

Thanks for your answer. For sure it will be great if you can show me how to do it by method 2.

I am trying to implement some new features to a fortran-written program and the new codes are written in Java. If there is a way to communicate between Fortran and Java through dll, then I don't need to re-write the Java code into C or Fortran which definitely saves time.

Sergey Kostrov wrote:

>>...I am trying to call a JAVA DLL from Fortran but I cannot find any tutorial on this issue. I wonder anyone has any experience...

I'm not 100% sure that it is possible to call Java Dll directly from Fortran application, like:

1. FortranApp -> JavaDll

But, if you create an additional layer as C/C++ Dll it is possible, like:

2. FortranApp -> CCppDll -> JavaDll

Or, if you create an additional layer as Java-based COM interface it is possible as well, like:

3.1 FortranApp -> JavaCOMDll -> JavaDll
or
3.2 FortranApp -> JavaCOMDll

I can look at my CD archives if you need some generic codes for solution 2, that is CCppDll -> JavaDll, and confirm if you really need it.

[ye_T_1]

Hi

I've never used Java so I am not sure about your question. The situation is I am trying to implement a new feature into a Fortran-written program and the codes for new feature is written in JAVA. So I need some tutorial about how to call a JAVA DLL from Fortran program. Thanks a lot for your reply. Maybe I didn't explain my question clearly.

iliyapolak wrote:

Hi,

Do you mean to call java methods class wrapped into some dll file or are you refering to some part of JVM installation implemented on windows as a dll file?

[Bernard]

Hi, I understood your question and I will try to find some information about the calling java code from fortran Here link about the JNA interface,but this is related to calling fortran from java: http://javaforge.com/wiki/66061

[Bernard]

You can find info about the calling fortran from java,but reverse operation is not very well documented.

[Bernard]

>>>I've never used Java so I am not sure about your question. The situation is I am trying to implement a new feature into a Fortran-written program and the codes for new feature is written>>> Is this java feature related to scientific or math related code?Can not you simply port that feature to fortran?

[ye_T_1]

I agree. I do find some about the reverse one but not call java from fortran

iliyapolak wrote:

You can find info about the calling fortran from java,but reverse operation is not very well documented.

[ye_T_1]

Since it's alrady written in JAVA, it would save time if Fortran can directly call Java. If it is not doable, then we might divert to plan B to re-write the codes in C/C++ or fortran.

iliyapolak wrote:

>>>I've never used Java so I am not sure about your question. The situation is I am trying to implement a new feature into a Fortran-written program and the codes for new feature is written>>>

Is this java feature related to scientific or math related code?Can not you simply port that feature to fortran?

[SergeyKostrov]

>>...For sure it will be great if you can show me how to do it by method 2... I'll take a look and let you know as soon as I find that small test project on my CDs ( it was almost 6 years ago... ).

[Bernard]

I would like to suggest you waiting for Sergey's input and if this won't help, try to port the code to fortran.Is java code highly object-oriented?

[SergeyKostrov]

There are two news and, as usual, one is good and another one is not good. I found sources in 2006 CD archives but, unfortunately, it is not applicable for your case. Just in case, a zip file with sources is attached and the test demonstrates how a C/C++ DLL could be called from a Java applet: Java applet -> C/C++ DLL Note: Java NI stands for Java Native Interface