You run the JAVA IBMi command? That will start a new JVM every time, and explains your bad performance.
You might consider putting the Java code directly in your RPG. That will start one JVM and reuse it.
-----Original Message-----
From: Duncan McManus [mailto:Duncan.McManus@xxxxxxxxxxx]
Sent: Monday, March 18, 2019 11:51 AM
To: 'Java Programming on and around the IBM i' <java400-l@xxxxxxxxxxxxxxxxxx>
Cc: David Gibbs <david@xxxxxxxxxxxx>
Subject: RE: Java startup performance
Hi
This is essentially what is happening. It is called once from a simple CL program using the 'Java' command, and runs all day communicating via data queues with RPG programs.
I just don't understand why the AS400 is so slow to startup, when a PC can do it in a fraction of the time.
Thanks
Duncan
-----Original Message-----
From: JAVA400-L <java400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of David Gibbs via JAVA400-L
Sent: 18 March 2019 16:44
To: Java Programming on and around the IBM i <java400-l@xxxxxxxxxxxxxxxxxx>
Cc: David Gibbs <david@xxxxxxxxxxxx>
Subject: Re: Java startup performance
On 3/18/2019 11:36 AM, Duncan McManus wrote:
How can I improve the startup performance of Java applications on the
AS/400?
How is it being loaded? Invoked by a user? Called from RPG? Called from Java?
My recommendation would be to engineer the application to run as a server and take requests, and send results, via a data queue.
Then the Java code is running all the time and can be activated by anything that can send a data queue entry.
You will experience the startup penalty once and then the code is active.
david
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