RE: Prevent JVM from starting again and again

[Justin Taylor <JUSTIN@xxxxxxxxxxxxx>]

Correct, when RPGLE calls Java it runs within the same job so it only starts the JVM once (which can be a double-edged sword).  

Another option might be to create a master Java app the you can call, and it in turn would call each of the individual Java apps.  That would only start the JVM once.  (That may not be practical depending on your specs.)



-----Original Message-----
From: Madie [mailto:bpcs.erp@xxxxxxxxx] 
Sent: Tuesday, September 04, 2018 2:50 PM
To: Java Programming on and around the IBM i <java400-l@xxxxxxxxxxxx>
Subject: Re: Prevent JVM from starting again and again

Sure, I tried using RUNJVA interactively and I found passing parameter to be cumbersome... seems it does not like parameter length above 256 chars?
Anyways, do you mean you are calling Java methods/class within RPGLE and its not causing new JVM to be started? I am thinking to implement it as last resort... appreciate your reply...

On Tue, Sep 4, 2018 at 10:54 PM, Justin Taylor <JUSTIN@xxxxxxxxxxxxx> wrote:

> FWIW, the RUNJVA CL command can run Java apps and could probably be 
> substituted for QSH.  I haven't used RUNJVA since 7.1 (or earlier), 
> but when I did it started a new JVM for every call.
>
> We're an RPG shop, so I'd just write an RPG program that would call 
> all the Java apps, and that would reuse the same JVM.  I can't say 
> about an OS command/API, since I've never needed one.
>
> HTH