Thread Subject: Matlab callbacks from Java

I am currently developing a library for Matlab users at my company. The functions in the library are such that I hope to write the code in Java or C++ rather than in M. I have written Java code that is called by Matlab in the past and find it to be a nice interface, but this time I require my library functions make calls back to Matlab (ideally via function handles). This seems to be possible using C or C++ Mex files, but I was hoping to code in Java, not C/C++. Google searches haven't yielded any obvious solution. Is it not actually possible to do something like the following:

1) Make a Java call from matlab
2) From the called Java function, make multiple Matlab calls (either using Matlab function handles, function names, or anything else).

If this is possible, great! If not, I'm assuming I can do what I want using C/C++ MEX files.

Thanks in advance for your insight.

"Shawn Hershey" <shliabnt@gmail.com> wrote in message <ggdepe$2hu$1@fred.mathworks.com>...
> I am currently developing a library for Matlab users at my company. The functions in the library are such that I hope to write the code in Java or C++ rather than in M. I have written Java code that is called by Matlab in the past and find it to be a nice interface, but this time I require my library functions make calls back to Matlab (ideally via function handles). This seems to be possible using C or C++ Mex files, but I was hoping to code in Java, not C/C++. Google searches haven't yielded any obvious solution. Is it not actually possible to do something like the following:
>
> 1) Make a Java call from matlab
> 2) From the called Java function, make multiple Matlab calls (either using Matlab function handles, function names, or anything else).
>
> If this is possible, great! If not, I'm assuming I can do what I want using C/C++ MEX files.
>
> Thanks in advance for your insight.

What you require is JMI (Java-Matlab interface) - it's available but undocumented and discouraged by Matlab for reasons unknown. You can google JMI or search this forum for some references. Xtargets (http://www.xtargets.com/snippets/tag/jmi) and JMatLink (http://www.held-mueller.de/JMatLink/) are also good starting points. You can also explore the jmi.jar package which is bundled with Matlab (in the ...\Java\jar\ folder).

Yair Altman