Re: Call system API from Java

Dieter,

It will be on IBM i.  It's a Java program and I need to call an IBM i 
API.  I was thinking along the lines of JNI, I have done some of that in 
Windows.  I just needed an example to understand a little more about the 
needed references and libraries (if any).  I could do it in ROG is I had 
to but the Java program was pretty complete...just needed that IBM i API 
call to finish it.  I really don't want to rewrite the thing so I can 
use RPG to make the API call into a system API.

I'll keep poking around.  I know I could go the JT400 route but even 
those API's are wrappers around JNI calls to system services (I think).  
I saw some code that was using sockets to communicate but I think they 
were DB routines.

Still looking

Pete Helgren
www.petesworkshop.com
GIAC Secure Software Programmer-Java
Twitter - Sys_i_Geek  IBM_i_Geek

On 2/23/2020 1:18 AM, D*B wrote:
> <Pete>
> Can't seem to find an example of this that doesn't involve using the 
> jt400 toolkit or PCML.  I also thought *I* had written one of these at 
> one time but can't seem to dig it up.  The goal is to make a call to a 
> system API in Java. Similar, I guess, to the Java API's that wrap 
> system API's found in JT400 (which must exist but I haven't found a 
> good example there either)
>
>
> Anyone got something simple?
> </Pete>
>
> Hi Pete,
>
> what problem do you wan't to solve? If your java code should run on 
> local AS/400, JNI would be possible. If your java code is coming from 
> another box, you would have to adress some listener. Anyway you would 
> have to do some conversions from java data types to binary data 
> formats, understood by as400 native code.
> Some time ago, I was working in a project to develop an as400 plugin 
> for a java based  monitoring software. The alternatives for me were: 
> installing toolbox locally or installing some java code on the server. 
> I decided to go the first alternative.
> My recommendations from this:
> - stay away from PCML and recordFormat ...
> - start with wrappers for the toolbox conversions (using the toolbox 
> classes you could put in every garbage and it will crash trying 
> converting back)
> - encapsulate all toolbox stuff in classes of your own to avoid to 
> spread it around
> examples for dataQ APIs could be found my open source 
> AppServer4RPG/ArdGate.
> For some API examples drop me a private mail.
>
> Dieter
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