Re: Setting up a Java Callback to Ada

["Marc A. Criley" <mcqada95@earthlink.net>]

Jim Rogers wrote:
> 
> Note that the JNI model of software development ALWAYS starts with Java.
> First you define your class containing remote methods. Then you create a
> C header file from those methods using the javah tool. You implement the
> corresponding C functions. You also implement the Java code to call the
> remote methods. The C functions must handle all compatibility issues.
> 
> If you want Java to call an Ada subprogram you must build a C wrapper
> that Java actually calls. That wrapper will handle all data
> compatiblity issues and call the Ada subprogram. Trying to use JNI to
> communicate between Java and Ada means programming in three languages.
> 

Jim is correct here.  As an exercise a couple years ago I did in fact
have Java call an Ada subprogram via JNI.  It worked, but I had to have
the C wrapper, and also additional (native) C functions to call adainit
and adafinal.

Marc A. Criley
Consultant
Quadrus Corporation
www.quadruscorp.com